This happened to me on one of the leaks. Ended up sbfing back to froyo and it fixed the issue so I knew it wasn't the camera. Come to find out it was the last video I took some how didn't save correctly and got corrupted. When the camera or camcorder app opened, it tried to load that little preview in the bottom left for the gallery, freezing the camera. Try deleting the last video or picture you took. Hope this helps.
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