Regarding the overstrike problem on the PM folder column headings, I did see this problem the first time I viewed the PM page with IE8, but then I clicked the refresh button, and now I can no longer make it happen. If you're able to repeatedly reproduce this then just tell me the steps.
Heh, I can't get it to happen anymore.
About the failure to paint the entire page, I see this maybe once a week. If you're seeing it more often can you think of any sequence of things you do that might lead up to this?
I almost always right-click and open in new tab. I'll either pick the latest message from the all topics page and go right to it or go to one of the page numbers from the topic column. I'll open a few new tabs from the all topics page and then go through them individually to find (occasionally) one of the pages hasn't loaded fully.