>>When I run my vfp5 app on NT4/SP4 and go to a certain process, I get the above message & good old Doc Watson. Under Win95, there has never been a problem like this. I guess I'll have to install vfp5 to debug, but has anyone ever encountered this problem?
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>That's usually a sign of data/index corruption. Try re-creating your index files first.

Hmmm...yes, I'm familiar with that, but...I had opened the tables, and all appeared well with indexes. I opened the DBC, did a VALI DATA, and all was well. Ran it again in Win95, all was well, data looked fine, sorts worked, etc...

Then I took your advice, and ran my Reindex.prg. Now it runs fine in NT. I must say thanks Fred, but -- is NT more sensitive, or something?