Yes, there is a problem with using filterd cursors in grids. Microsoft knows this and there is a Knowledge Base article (Q174584) about it. Their recommendation is to use the SET KEY TO command instead of the SET FILTER TO.

>Hello John,
>
>I can't help you on why it is happening but I avoid using filters when ever possible. When I want the user to be able to update a "filtered" list I prefer to use the SET KEY TO command. I don't see it used very often. In fact it is absent from many FPW/VFP books. But it works very fast. Good luck.
>
>Regards,
>
>Paige