Jos,

1) I've dropped a little MemoryLogger class on the two forms in question.
The logfile is the last bit of this message. Is it significant? I don't know.
But if one keeps activating these form alternately, it sure looks like it's gonna crash the program eventually.

2) That's why I put this question here in the first place. Yes sir, it bombs!
This used to happen after about 64 clicks, give or take a few.
I have not been able to reproduce it after I implemented your suggestions, but the log seems to imply that it eventually will happen.

3) Nothing special, all native VFP stuff, pageframe with up to 3 pages, a bunch of labels, textboxes, editboxes, a few dropdowns and a grid or two, in short all pretty pedestrian stuff.

4) Yes, it seems to release all the memory upon exit.

Here's the log. All values are in (Bytes / 1024).
1st value = Entry value
2nd value = Exit value
3rd value = Difference

I've put some asteriks' and exclamation marks where I find the values a bit strange.

Offhand I'd assume that running the same code over and over again should npt

2004.03.29 13:44:14    Invoices    : Run      1:   3374.11   3381.79      7.68
2004.03.29 13:44:17    Reservations: Run      1:   3792.36   3802.74     10.38
2004.03.29 13:44:25    Invoices    : Run      2:   3381.79   3813.96    432.17
2004.03.29 13:44:27    Reservations: Run      2:   3802.74   3814.31     11.57
2004.03.29 13:44:28    Invoices    : Run      3:   3813.96   3814.35      0.39
2004.03.29 13:44:29    Reservations: Run      3:   3814.31   3814.62      0.31
2004.03.29 13:44:30    Invoices    : Run      4:   3814.35   3823.01      8.66
2004.03.29 13:44:31    Reservations: Run      4:   3814.62   3823.36      8.73
2004.03.29 13:44:32    Invoices    : Run      5:   3823.01   3823.45      0.44
2004.03.29 13:44:33    Reservations: Run      5:   3823.36   3823.68      0.32
2004.03.29 13:44:34    Invoices    : Run      6:   3823.45   3823.82      0.37
2004.03.29 13:44:35    Reservations: Run      6:   3823.68   3824.14      0.46
2004.03.29 13:44:35    Invoices    : Run      7:   3823.82   3824.26      0.45
2004.03.29 13:44:36    Reservations: Run      7:   3824.14   3857.59     33.45	*  
2004.03.29 13:44:38    Invoices    : Run      8:   3824.26   3857.63     33.37	*
2004.03.29 13:44:38    Reservations: Run      8:   3857.59   3857.90      0.31
2004.03.29 13:44:39    Invoices    : Run      9:   3857.63   3858.02      0.39
2004.03.29 13:44:40    Reservations: Run      9:   3857.90   3858.34      0.43
2004.03.29 13:44:41    Invoices    : Run     10:   3858.02   3858.51      0.49
2004.03.29 13:44:42    Reservations: Run     10:   3858.34   3858.76      0.43
2004.03.29 13:44:42    Invoices    : Run     11:   3858.51   3858.82      0.31
2004.03.29 13:44:43    Reservations: Run     11:   3858.76   3859.08      0.32
2004.03.29 13:44:44    Invoices    : Run     12:   3858.82   3859.29      0.47
2004.03.29 13:44:45    Reservations: Run     12:   3859.08   3859.62      0.54
2004.03.29 13:44:45    Invoices    : Run     13:   3859.29   3859.68      0.39
2004.03.29 13:44:46    Reservations: Run     13:   3859.62   3859.93      0.31
2004.03.29 13:44:47    Invoices    : Run     14:   3859.68   3860.07      0.39
2004.03.29 13:44:48    Reservations: Run     14:   3859.93   3860.40      0.47
2004.03.29 13:44:48    Invoices    : Run     15:   3860.07   3860.54      0.47
2004.03.29 13:44:49    Reservations: Run     15:   3860.40   3860.79      0.39
2004.03.29 13:44:50    Invoices    : Run     16:   3860.54   3860.86      0.31
2004.03.29 13:44:50    Reservations: Run     16:   3860.79   3861.18      0.39
2004.03.29 13:44:51    Invoices    : Run     17:   3860.86   3894.46     33.61	*
2004.03.29 13:44:52    Reservations: Run     17:   3861.18   3894.79     33.61	*
2004.03.29 13:44:53    Invoices    : Run     18:   3894.46   3894.83      0.37
2004.03.29 13:44:54    Reservations: Run     18:   3894.79   3895.07      0.28
2004.03.29 13:44:54    Invoices    : Run     19:   3894.83   3895.22      0.39
2004.03.29 13:44:55    Reservations: Run     19:   3895.07   3895.50      0.43
2004.03.29 13:44:56    Invoices    : Run     20:   3895.22   3895.71      0.49
2004.03.29 13:44:56    Reservations: Run     20:   3895.50   3895.93      0.43
2004.03.29 13:44:57    Invoices    : Run     21:   3895.71   3896.03      0.31
2004.03.29 13:44:58    Reservations: Run     21:   3895.93   3896.32      0.39
2004.03.29 13:44:58    Invoices    : Run     22:   3896.03   3896.47      0.45
2004.03.29 13:44:59    Reservations: Run     22:   3896.32   3896.82      0.50
2004.03.29 13:45:00    Invoices    : Run     23:   3896.47   3896.89      0.41
2004.03.29 13:45:01    Reservations: Run     23:   3896.82   3897.14      0.32
2004.03.29 13:45:01    Invoices    : Run     24:   3896.89   3897.28      0.39
2004.03.29 13:45:02    Reservations: Run     24:   3897.14   3897.61      0.47
2004.03.29 13:45:03    Invoices    : Run     25:   3897.28   3897.72      0.45
2004.03.29 13:45:04    Reservations: Run     25:   3897.61   3898.00      0.39
2004.03.29 13:45:05    Invoices    : Run     26:   3897.72   3898.04      0.31
2004.03.29 13:45:06    Reservations: Run     26:   3898.00   3898.39      0.39
2004.03.29 13:45:06    Invoices    : Run     27:   3898.04   3898.53      0.49
2004.03.29 13:45:07    Reservations: Run     27:   3898.39   3898.86      0.47
2004.03.29 13:45:08    Invoices    : Run     28:   3898.53   3898.92      0.39
2004.03.29 13:45:08    Reservations: Run     28:   3898.86   3899.17      0.31
2004.03.29 13:45:09    Invoices    : Run     29:   3898.92   3899.31      0.39
2004.03.29 13:45:10    Reservations: Run     29:   3899.17   4031.54    132.38	!!!
2004.03.29 13:45:11    Invoices    : Run     30:   3899.31   4031.66    132.35	!!!
2004.03.29 13:45:12    Reservations: Run     30:   4031.54   4031.86      0.32
2004.03.29 13:45:14    Invoices    : Run     31:   4031.66   4031.97      0.31
2004.03.29 13:45:15    Reservations: Run     31:   4031.86   4032.32      0.46
2004.03.29 13:45:16    Invoices    : Run     32:   4031.97   4032.44      0.47
2004.03.29 13:45:17    Reservations: Run     32:   4032.32   4032.79      0.47
2004.03.29 13:45:18    Invoices    : Run     33:   4032.44   4032.86      0.41
2004.03.29 13:45:19    Reservations: Run     33:   4032.79   4033.11      0.31
2004.03.29 13:45:20    Invoices    : Run     34:   4032.86   4033.22      0.37
2004.03.29 13:45:21    Reservations: Run     34:   4033.11   4033.57      0.46
2004.03.29 13:45:24    Invoices    : Run     35:   4033.22   4033.69      0.47
2004.03.29 13:45:24    Reservations: Run     35:   4033.57   4033.89      0.32
2004.03.29 13:45:25    Invoices    : Run     36:   4033.69   4034.03      0.34
2004.03.29 13:45:26    Reservations: Run     36:   4033.89   4034.36      0.46
2004.03.29 13:45:27    Invoices    : Run     37:   4034.03   4034.47      0.45
2004.03.29 13:45:28    Reservations: Run     37:   4034.36   4034.82      0.46
2004.03.29 13:45:29    Invoices    : Run     38:   4034.47   4034.86      0.39
2004.03.29 13:45:30    Reservations: Run     38:   4034.82   4035.13      0.31
2004.03.29 13:45:31    Invoices    : Run     39:   4034.86   4035.25      0.39
2004.03.29 13:45:32    Reservations: Run     39:   4035.13   4035.61      0.48
2004.03.29 13:45:33    Invoices    : Run     40:   4035.25   4035.72      0.47
2004.03.29 13:45:34    Reservations: Run     40:   4035.61   4035.92      0.32
2004.03.29 13:45:35    Invoices    : Run     41:   4035.72   4036.04      0.31
2004.03.29 13:45:36    Reservations: Run     41:   4035.92   4036.39      0.47
2004.03.29 13:45:38    Invoices    : Run     42:   4036.04   4036.50      0.47
2004.03.29 13:45:38    Reservations: Run     42:   4036.39   4036.78      0.39
2004.03.29 13:45:39    Invoices    : Run     43:   4036.50   4036.86      0.36
2004.03.29 13:45:40    Reservations: Run     43:   4036.78   4037.13      0.35
2004.03.29 13:45:41    Invoices    : Run     44:   4036.86   4037.29      0.42
2004.03.29 13:45:41    Reservations: Run     44:   4037.13   4037.64      0.50
2004.03.29 13:45:42    Invoices    : Run     45:   4037.29   4037.75      0.47
2004.03.29 13:45:43    Reservations: Run     45:   4037.64   4038.03      0.39
2004.03.29 13:45:44    Invoices    : Run     46:   4037.75   4038.07      0.31
2004.03.29 13:45:45    Reservations: Run     46:   4038.03   4038.42      0.39
2004.03.29 13:45:46    Invoices    : Run     47:   4038.07   4038.54      0.47
2004.03.29 13:45:46    Reservations: Run     47:   4038.42   4038.81      0.39
2004.03.29 13:45:47    Invoices    : Run     48:   4038.54   4038.95      0.41
2004.03.29 13:45:48    Reservations: Run     48:   4038.81   4039.16      0.35
2004.03.29 13:45:48    Invoices    : Run     49:   4038.95   4039.34      0.39
2004.03.29 13:45:49    Reservations: Run     49:   4039.16   4039.67      0.50
2004.03.29 13:45:49    Invoices    : Run     50:   4039.34   4039.81      0.47
2004.03.29 13:45:50    Reservations: Run     50:   4039.67   4040.02      0.36
2004.03.29 13:45:51    Invoices    : Run     51:   4039.81   4040.12      0.31
2004.03.29 13:45:52    Reservations: Run     51:   4040.02   4040.45      0.43
2004.03.29 13:45:52    Invoices    : Run     52:   4040.12   4040.57      0.45
2004.03.29 13:45:53    Reservations: Run     52:   4040.45   4040.92      0.47
2004.03.29 13:45:54    Invoices    : Run     53:   4040.57   4040.96      0.39
2004.03.29 13:45:54    Reservations: Run     53:   4040.92   4041.23      0.31
2004.03.29 13:45:55    Invoices    : Run     54:   4040.96   4041.35      0.39
2004.03.29 13:45:56    Reservations: Run     54:   4041.23   4041.70      0.47
2004.03.29 13:45:57    Invoices    : Run     55:   4041.35   4041.82      0.47
2004.03.29 13:45:58    Reservations: Run     55:   4041.70   4042.09      0.39
2004.03.29 13:45:58    Invoices    : Run     56:   4041.82   4042.15      0.34
2004.03.29 13:45:59    Reservations: Run     56:   4042.09   4042.48      0.39
2004.03.29 13:46:00    Invoices    : Run     57:   4042.15   4042.60      0.45
2004.03.29 13:46:01    Reservations: Run     57:   4042.48   4042.94      0.46
2004.03.29 13:46:02    Invoices    : Run     58:   4042.60   4042.99      0.39
2004.03.29 13:46:04    Reservations: Run     58:   4042.94   4043.23      0.29
2004.03.29 13:46:05    Invoices    : Run     59:   4042.99   4043.38      0.39
2004.03.29 13:46:06    Reservations: Run     59:   4043.23   4043.73      0.50
2004.03.29 13:46:10    Invoices    : Run     60:   4043.38   4044.19      0.81
2004.03.29 13:46:11    Reservations: Run     60:   4043.73   3671.25   -372.48	Closed Invoices
2004.03.29 13:46:11    Reservations: Run     61:   3671.25   3667.11     -4.14  Closed Reservations

>Peter.
>
>1) How much memory gets used each time you activate form 1 then form 2 etc. Is it significant?
>
>2) Does VFP actually end up having a problem? ie. have you tried to go "all the way" to a point of failure?
>
>3) What is on those forms? Any active x controls, any special processing in the activate event?
>
>4) If you have x Mg memory before you start your app, then run your app, and then exit your app, have you still got x Mg of memory? If so then its not a leak but VFP was using it for some reason and properly gave it back when the app was finished.
>
>Also, check this thread/message for some more background info:
>
>Re: SYS(3050) Not Respected According to Task Manager Thread #728197 Message #728231
>
>
>>Thank's guys,
>>
>>Jos,
>>
>>I've tried your suggestions, and they seem to slow the memory leak down, but do, as far as I can see, not eliminate the problem.
>>
>>Since this all happens just by the following sequence:
>>
>>Load Form1
>>Activate Form1
>>
>>Load Form2
>>Activate Form2
>>
>>Activate Form1
>>Activate Form2
>>Activate Form1...Activate Form2...1,2,1,2, a.s.o.
>>