Hi Jim,

when i test a VFP behaviour,
some time I succeed to guess the inner structure of program C that implements it.
But my job is not to study like works VFP internally (would have to make it the members of the VFPT) or exec a reverse engineering of it.

As far as the corruption of the CDX, i dont think that this problem centers a lot, but when I see that changing _ command.prg it changes the operation of a SELECT, I must only think that some internal C memory pointers has go huntinged of bytes in the heap.

Fabio