Ok, I did deinstall the power kernel with instructions given in the wiki.maemo.org/kernel_power and now with the stock kernel, the stock camera is working normal again. I am wondering though, how it is just me having this problems with the power kernel...

edit: the post you mentioned (http://talk.maemo.org/showpost.php?p...&postcount=246) states, that there are problems known with power kernel < v.46. But when I installed the power kernel with the application manager in september from extras-testing, it was only offering version 2.6.28.10power42