You are not alone. Check out my complaint 1442832.

>Hi
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>I experience regular problems with the display of UT. I have a number of times this week seen an empty message list with the message detail showing a message. I have to use the time warp feature and go back a day to see the display properly. Also today the display did not have the toolbar along the top of the screen so I could not access my profile or setup etc. It also did not show the Links, Online,Offline, Folders, or Reply widgets. Instead all I had was time warp, search and message ID. Once I refreshed the screen everything except the message list displayed.
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>These problems are becoming a regular occurrence on UT. I am using Window 7 and Chrome 4/Firefox 3.6.
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>Simon