wish i could help but this has never happened to me as i don't use a VF (or legacy lenses yet) on my E-P2. i have, however, had the camera freeze on me before.... when this happens the aperture reading on the LCD (in A priority) or the shutter speed reading (in S priority) completely blacks out and i am left being able to do anything including fire the shutter. sometimes i can turn off the camera with the power button but other times i'm forced to take out the battery to turn it off.... *shrugs* it has only happened a handful of times, so i don't really worry about it. it probably isn't even related to your problem, but hopefully your problem isn't serious.
edit: on a side note, i have never had to reset my camera.