After a recent Windows Update IE 10 users are having issues with Unicode Characters in nicknames not displaying correctly. We have found this is directly releated to the Windows Update and are working to correct the problem. We suggest that users try alternative browsers such as Firefox or Chrome until the issue can be fixed.
Update: The issue appears to be with Flash. After the windows update the flash version updated for IE and it causes a problem with unicode characters. Still investigating.
Update: The bug is being addressed by Adobe. You can read more about the bug HERE. The only current solution is to use an earlier version of adobe flash.
Update for Vista users. Please read HERE
Update2: The issue has been repaired in the latest microsoft IE update. Please ensure you have the latest updates installed.