Here's an interesting observation. On 19.7.2010 I pulled updates via synaptic in the hope it would pull in a fix for this that might have happened. But that wasn't the case. Then I pulled the live-cd image of the same day, put it on a usb-stick and did a fresh install from that one. This actually solved the issue and fixed tihs bug. This leads to the assumption, that this might be a package-issue or something similar.
Here's an interesting observation. On 19.7.2010 I pulled updates via synaptic in the hope it would pull in a fix for this that might have happened. But that wasn't the case. Then I pulled the live-cd image of the same day, put it on a usb-stick and did a fresh install from that one. This actually solved the issue and fixed tihs bug. This leads to the assumption, that this might be a package-issue or something similar.