Was in the main menu for some time and then rejoined. Upon re-entry, the main UI was not displaying and all input was not registered (keyboard and mouse wouldn't move map). I tried taking a screenshot, but, for whatever reason, the screenie captured the underlying screen (chrome; I can provide it if you want it, but it should be rather useless).
Hope this helps.
Here's the log files should you need em:
“Nobody trips over mountains. It is the small pebble that causes you to stumble. Pass all the pebbles in your path and you will find you have crossed the mountain.”
- Author Unknown