My gut feel is that the banner ad shown on the transition page is the cause of the problem. If the ad appears, the browser moves on to the intended destination, but if the ad doesn't appear (maybe blocked by one of my many security measures as being unsecure, or from a suspect site, or even if the ad serving site didn't respond in time), the transition page stays there forever.
Selecting the link by itself (deleting the safeurl bits) gets me to the desired page without problems, so that's what I'm doing now (copy/paste base link into new browser window).
Anyway, since you know German, you'll be able to check out anonym.to
