Works fine for me in Firefox 3.5.2
This is how I had the grid set up.
|<telerik:RadGrid ID="RadGrid1" runat="server" DataSourceID="SqlDataSource1"
| AllowFilteringByColumn="True" AllowSorting="True">
The only problem I ran into was that when I put in something that had the wRoNg CaSe, it sent nothing back.
are you saying that the grid doesn't recognize that you hit enter?