My (used) new G5 just arrived. Very exciting. I can't get the flash to turn on in any mode but C1/C2 though. From reading the manual, it looks like I should be able to turn on the flash myself in PSAM, but they don't work. The flash menu is disabled (greyed out and skipped over as I scroll through), regardless of how I attempt to access it (quick menu, full menu). When I flip from C1 to M the icon on the rear LCD goes from flash-on (the lightning bolt) to flash-off (the bolt with a circle-slash through it), even without changing settings. I've tried popping up the pop-up flash, tried a third-party flash (manual, not auto), and nothing works. Is this a known problem? Is there something about the interface I don't know about? This is my third Panasonic m43 camera (after a G1 and GF3), so I'm comfortable with the way Panny "thinks." Help?