>I had the same error again only this time I was not adding
>a property I was simply scrolling down the object properties
>window while it was combined docked with the command window
>and datasession window in a tabbed page format.

< sigh > Lovely.

Have you tried trashing all copies of FoxUser.dbf to make sure they're not corrupted?

Also, if you turn the hardware acceleration down in your Display settings, does the problem go away?