There's a chance something's screwy with the camera. Settings may have changed without you knowing.
There's also a (better) chance that something is screwy with your computer.
What are your memory and multiprocessing settings? What are your computer's specs?
CS5 10.0.0.2.4, so it should be the latest one. At least it can't find new updates.
Intel Core i5-760 2.8 GHz quadcore
Ati Radeon HD 5700 series
Running on Windows 7.
Make sure you have multiprocessing turned off. You don't have nearly enough RAM to use it.