Of course the same bug live on the dbase commands:

CREATE CURSOR CONTDB (LN C(10),lencode I )
INSERT INTO CONTDB VALUES ('',1)
INSERT INTO CONTDB VALUES ('',0)
INSERT INTO CONTDB VALUES ('',3)
INDEX ON SUBSTR(ln,1,lencode) TAG TT

SET ORDER TO 
CLEAR
SET EXACT OFF

COUNT FOR 'X' =  SUBSTR(ln,1,lencode) && this is not optimized on VFP9 and return a correct 3 counts.
? 'optimized cound return :',_TALLY
COUNT NOOPTIMIZE FOR 'X' =  SUBSTR(ln,1,lencode)
? 'nooptimized count return :',_TALLY

Then, in VFP9 also for the commands dbase,
when the not more optimized string's functions are used,
you can expected different results.

Fabio