I installed the 11.4 preview drivers yesterday and the text in all my apps went blurry. I rolled the driver back and it was fine. Live Mail was the worst. I could not read anything. The body of the messages was OK, but the titles of the emails and the folders was all blurry. The text in Firefox was blurred, too. Turning off hardware acceleration fixed the Firefox issue but when I rolled back I was able to turn hardware accelleration on again with no blur. This is definitely a driver problem.