Thanks for the follow-up. Alexander has been able to replicate the issue with FF 18.0.2 on Win8, but I've been unable to after repeated attempts, so it appears that the problem is inconsistent even in FF on Win8.
That said, I'll add this item to the backlog for the Kendo Dojo and we'll take a look in the future. In the meantime, since this is not an issue with Kendo UI itself, you should be fine using the Grid, and the Dojo in any other browser on Win8.
the Telerik team
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI