This has been annoying me for a while, but I only just now bothered to do the search to see if it was previously reported.
Seems there is a watermark on the stats pages that may be placed in a layer over the stats.
Appears in white text, but the element is on top of the stats information. So whichever project happens to be underneath the location the watermark lands isn't clickable.
In my case, that's on Enigma at the moment. It's annoying, but thankfully doesn't exist on the stats6 versions of the pages.
Just thought I'd finally mention it.
PS: I just noticed this currently only seems to be a problem with Firefox 34.0 under Ubuntu. It's not a problem in Firefox 35.0.1 on Windows.