I have been having an issue whereby in M mode, with lenses other than the kit lens (that I've noticed...), the E-P3 periodically stops letting me adjust the shutter speed manually - it'll work for a while then stop. This is the case whether I use the wheel control, or if I push the +/- control on the wheel and then try to use the arrows to adjust the shutter. Happening with a Panasonic Lumix 20mm f1.7 and an old Pentax lens through a K mount adapter. Is anyone else having this issue? Is it related to using non-Oly lenses? It's really annoying - I need to stop and switch the camera into another mode (usually S since it's next on the dial) and back in order to regain the ability to adjust the shutter speed manually.