GH3 GH3 Macroblocking?!?!

I don't believe that is in camera macroblocking. The only time I've seen that with anything I shot turned out to be due to my built in multi card reader beginning to go out.

If you haven't erased or reformatted that media card, try reading it from an external reader. In my case those little single format SDHC readers they used to include with some SanDisk cards worked perfect (plugged into a USB port). And that caused me to order an inexpensive multi format external reader by Delkin which I use with that computer to this day.

It's conceivable the media card could also be the "culprit".
 
I would suspect a defective SD card, or a card that needs to be formatted in camera before shooting. ( as a rule I always format my SD cards in camera before I shoot with them )
 
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