Camera Locking after potion use

Hi, I have develpoed a fantastic new problem. When I use a potion, the potion shows as 'almost finished' and the camera locks in place. I can still move around, but the camera doesn't follow. This also happens in general gameplay - 5 minutes things are normal, then the camera locks again. I can still cast and run around, but can't move beyond where I can 'see'. If I die and res, the camera is free again.
Any ideas? I have cleaned up disc and defragged. The only thing I have downloaded which matches up time wise with the problem, is the new Windows Messenger (not that new, but I finally updated ^^).
Thanks for any help :-)
p.s. a couple of auto error reports have been sent to Anet, so it must recognise something is amiss.

there are potions?

Tonics / Potions ^^

could try "-repair"ing the client. other than that i don't know what to say i've never experienced this before.

From what i read it looks as though your lagging i have had similar situations where you can use skills but camera wont move but yeah try what has been said previous and repair gw or re install.

good luck and hope you can get it fixed

I ussed to have the same problem when i was drunk (in-game).
After a driver up-date for my video-card it was gone.

Thanks for the advice. I have done all the usual PC stuff - drivers/updates etc. After more frustrating hours of experimenting, I now know that my camera locks in place whenever I use a 'skill'. I can run around merrily space bar attacking, but as soon as I use Frenzy, or Summoning Stone, or any other skill, the camera no longer moves. I have referred this to Anet and will post again should I find an answer. Cheers.