Hmm, now it happend again.
What I did was running apt-get update followed by apt-get upgrade.
preenv was updated from 0.1.4 to 0.1.5.
I started Worms to see if that worked with the new preenv (it didnt, still wrong orientation) after that I started NFSU and played a few seconds on one lap.
Closed NFSU and started Conky and I discovered that hildon-desktop eats my CPU.
Strange.