> including linking with the VCL debug libraries - and then do a full

THAT'S THE POINT!

Thanks for your help. I think I got it. In DB.pas there is a line:

procedure TDataSet.FreeBookmark(Bookmark: TBookmark);
StrDispose(Bookmark); // here occurs the exception

in D6 this line is:

MemFree(Bookmark);

If I change the line to MemFree it seems to work fine. Can anybody
say if I it's ok to change this line to MemFree?

thx Andre