Originally Posted by Adam

The temporary fix for that, is on UOHerald.com

If your KR client is set to start in full screen, you may see a completely black screen with an error about a software renderer. We're working on the fix for this, but in the meantime, use the following workaround to get into windowed mode:
- Go into "My Documents", "EA Games", "Ultima Online", "User Data" and open the usersettings.xml file in a text editor.

- In the first line under "Graphics", change fullscreen="true" to fullscreen="false", then save the file.

That should get you going until we can patch out a fix. (Also, the no sound issue? That'll get fixed shortly as well!)