Xen on 31 May 2011
That is... really weird shit. I've never seen something like this, but you're kinda in luck, since others have.
AMD/ATI GPU I assume? Then your solution(s) are in the posts here. Seems to be a catalyst issue.
http://www.dslreports.com/forum/r25863999-Messenger-Messenger-blurry-after-upgrading-2009-to-2011
(being an Nvidia fan, I now see why I haven't seen it)
