When I first got my DX, I had a couple issues where I would try to use the camera and it would either just not do anything (may have just been user error, didn't realize rigfht away it was a 2-step button) but a few times it made the phone reboot either when I tried to open it or when I pushed the shutter button. But after doing a factory reset, the problem went away and the camera has been problem-free since then. So back up all you apps on Appbrain, put them into a seperate list than Apps on the Phone, then try a factory reset and reinstall Froyo, might help. Or might be a big pain, but that's why I'm just waiting for the OTA update. I was jailbroken on my iPhone, I'm used to not updating right away if at all!