Cannot access messaging history

[glurk1]

On the main site, since yesterday I can no longer access my message history. In the pane on the left side, I can see the people I have messaged with, but in the body on the right side, I can only see the most recent comment. The scroll bar on the far right to go back and access past dialog has disappeared. I tried clearing my cache to see if that would help, but no luck. I did delete a message yesterday, and all though it would seem unrelated, that is when the problem started. I am attaching a screenshot, any help would be appreciated!