It appears that certain questions are not accessible from the main page, e.g. this question: Re-writing sign basis. I finally got it over the user's page, but the links on the main page or the tag page seem not to be active, see here.
This already happened once to me, after a while the link was working. Why is that?
The strange behaviour is still present. Now from a different computer, but here's something interesting:
When I mark the question title, I get the following:
Does this give anyone a hint?