I have run in to this error with all versions of VFP6 to date, latest MSDN 8/98 version. I code and execute the following and get an Index Tag Not Found Error.

use A
set order to taga
sele 0
use b
set order to tagb
scan
.
.
if seek(variable, 'A')
do ...
endif
.
.
endscan

At the point of the SEEK(variable....), I get the tag error. So far, when the solution appears to be inserting the following immediately before the seek, SET order to taga in A. Problem gone.

Any thoughts. The original code runs without problem in FPW 2.6 and VFP5.0a, as I remember.