I have just noticed that on my activity tab a horizontal scrollbar appears at the bottom of the page (not in picture) and the
all tab appears to be cut off.
Tested in Chrome 8.0 & FF 3.6.8. IE7 is even more bizarre and has both scroll bars. I'm not too bothered about that though as I don't use IE.
This doesn't happen for SO or MSO just seems to be on WebApps