>Has anyone seen this error message in VFP6?

Yep. There have been several hundred messages on UT on this topic.

>It only comes up 2/3 times a week.
>Does anyone know the cause and possibly a fix?

MS and various other developers are working together to determine cause(s) and possible fixes for this. When I have experienced this, I have been able to trace it to a code error (i.e, my fat fingers coding something wrong)

>I know that improper use of hidden properties can cause
>this error, but I am sure there is no hidden properties
>in my app.
>Any info. is greatly appreciated.
>Thank you.
>Kevin.