Agnes,

This is a problem not just on one PC, but reported by several clients. It is random in nature and started about 6 months ago - presumably when more clients got PC's with > 1GB RAM. They can run the invoice (a very complicated fees program - not routine stuff) with the error and then reverse and redo the same thing exactly and not get the error. I used clients data side by side and NEVER happens on my PC's - none of my PCs are over 1 GB.

>Paul,
>
>hm, I run all my PC's with 2GB VFP9 SP1, Customers too. I never run into such problems.
>Surely it has to do with the VFP9 deals with the memory, but it could be outside VFP.
>
>Have you run a Memorytest / hardwaretest against the machine? Could you reproduce on other machines?
>
>My experience is, that errors like this result from bad hardware. Cruel things may happen with a bad capacitor.
>
>Agnes
>>Recently I posted a problem with random calculation and printing bug in VFP8/9 with one of my inventory apps. It would give strange results about every tenth time for some customers. But never happened on any of my PCs.
>>
>>OK. I think I have resolved the problem. It has to do with VFP8/9 memory handling. One of my customers has two PC's: one with 384KB RAM memory (no problem) and the other with 1.25GB (YES random problems). The app has quite a bit of memory variables, public and private, and quite a bit of string handling and various complicated functions. Note that I never had any problems on my PC's - but none of my PCs have RAM over 1GB. It seems that VFP8/9 does not manage memory properly with PCs over 1GB. The same previous version of the app used VFP5 with no problems - could it was in the < 1GB memory era.
>>
>>Here is the way I resolved it. I put the following code at beginning of my program:
>>
>>SYS(3050, 1, Min(536870912,VAL(SYS(3050, 1, 0))))
>>SYS(3050, 2, Min(536870912,VAL(SYS(3050, 1, 0))))
>>
>>That limits VFP buffer memory to lesser of available and 1/2 GB.
>>
>>My one 1GB PC had no problems and its VFP had about 0.75 available memory, so I put it at 1/2 GB max to be safe.