Was playing the game, saved and now keyboard doesn't work anymore except for escape. I can spin the camera around but that's all I can do. Reloading or restarting doesn't seem to fix it. Earlier save works but not replaying half the game just to get unstuck.

So im hoping for a fix for this weird bug, until that time game is shelved.

I'm having the same problem and its driving me nuts!!! Please guys learn how to program... damnit its just frikken input, its the first thing you to master in game programming 101!

*bump*

And maybe you should learn to use search button ;-)
It' well known bug and there are few posts about it
http://www.gog.com/en/forum/the_witcher_2/major_bug_geralt_wont_move_at_all
http://www.gog.com/en/forum/the_witcher_2/quen_causing_some_keys_to_stop_responding
http://www.gog.com/en/forum/the_witcher_2/los_of_control_during_swordfights
It' well known bug and there are few posts about it
It will hopefully get fixed in upcoming patch wich should come out anytime