Oscar,

>does the error appear often when you CLOSE the preview window? In this
>case, try to exit the preview using the form close button (i.e. x in right
>upper corner) and do NEVER use the exit door in the preview bar.

The error appears after opening the preview window. But
you are correct the error occurs only with using the door to
exit. The error does not occur using the X.
I also found the reason of my error: the report was set to Show position.
After deactivating in menu View, Show position the error vanished
(either X or door). Unfortunately there are some other reports
where my users reported problems which do not have this setting.

>are you running applications compiled with vfp 6 and vfp 7 on the same >machine? I have found that the error appears more often in this case, and
>only running the vfp-7 compiled app. If this is the case, even with
>resource set to OFF, delete the resource file just before starting your
>vfp7 app.

No.

Andreas