Happened the 2nd time around, but wasn't sure if it was the same card I used. But suddenly my MM refuses to read and display the image playback, cannot format, can't also click the shutter. Did already battery and card pull... still the same. I'm using a Sandisk 8gb Extreme 30mb/s SDHC.
Card can't also be read via the Sandisk ImageMate card reader over at my MBP. What I did is format the card on my Panasonic G3/GX1 and it works again. (And I don't swap around cards in between systems, I have assigned cards solely for the MM)
Temporary solution is to isolate the card first and observe if this happens again. And also did a Format / Overwrite to the card via the MM.
Anybody can chime in or help? TIA.