Hi Renoir

>This has started happening recently when I'm using the debugger. Really starting to p*ss me off as I can't find anything useful on what causes it and I never know when it's going to happen. Sometimes it is trashing my tables. Anyone have anything valuable regarding what I can do to stop it? Thanks!

You don't say what version of VFP this is but, as Fred suggests, first thing to try is to use a clean FoxUser table.

If you are using VFP 7 or later, and that doesn't work, try restoring the FoxCode table (the Intellisense Manager advanced tab has an option for this - but make sure you have flagged your custom items as Save = .T. first). I have seen this table cause problems in the debugger on occasions too.