>I have VFP 7 only on one PC.
>
>The application with the problem Runs on Windows XP with all updates ( as far as I can tell).
>
>It is using VFP7, SDT 6.0d.
>
>The error message occurs when ever I try to run a form in development mode.
>
>The error message is "Cannot lock table(s) for MyOperation"
>
>Problem is I cannot find the error message in the help file.
>
>I can re-index all the tables and update the work files. Should I do that?
>
Do you have SDT events turned on? Can this problem come from SDT?

I guess, it would not hurt to update and re-index the tables.