Not only power cycle, but I highly recommend that you get the master update from Peter Alfonso and update your phone with that - it won't erase your apps, but it will replace the 2.1patched-to-2.2 files with natively compiled 2.2 apps.
I have had no issues with the camera, but I have seen where a few people have.
If you don't want to try that just yet, a factory reset may (although I doubt it as the camera is a system app)....
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