I've seen this in IE 8 and Firefox 4. This does not seem to affect all sites, though. Security and Mechanics are affected, but RPG is not. I'll check around other sites and update this question as I find more.
- Board & Card Games
- Project Management
- Quantitative Finance
- Code Golf
- Code Review
- Graphic Design
Upon further review, this seems to be a sporadic problem - coming and going somewhat unpredictably. "Affected" now lists the sites I have seen it on, but the problem may not currently exist. Some of these were previously "Unaffected" though.
Although the Site Stats image says "loading", the statistics do not appear within an expected reasonable amount of time (if at all).
I just did a re-check of all the above sites, and it seems the issue is cleared up for now. Any ideas as to what might have caused this?