Thanks Christof.

In my first message I also said that we use Visual ProMatrix framework.
Today I have found that VPM base class is part of the situation because when I use FoxPro base class, it doesn't happen.

Anyway as you said I found the workaround, I will keep this schema.

Thanks you very much.


>Hi Juan,
>
>> This situation is with VFP6 SP5.
>
>That might explain it. There have been some bugs in VFP 6 regarding buffers that have been fixed in VFP 7. If the problem goes away when you use a more recent version of VFP, you might not want to spend time on nailing this down, since you already found a work around.