nothing wrong with the camera I am very sure
Probably nothing wrong with the camera indeed, but if I was in Rainer's situation, I'd do the same thing: return back the camera and back to Canon.
Those things, shouldn't happen.
And we have very little time and patience to deal with those sort of problems, whatever the source is.
I really like the GH2, mostly because IMO, it represents what the evolution of technology is driving us to: smallest and smallest equipments but each time more powerfull and versatiles.
But then again, the GH2 is a consummer product and if there's a lot to like about it, there's also a lot to complain too, starting with quality control.
I'm fed-up of those equipments made in China or Taiwan at very low cost, because most of the time there are issues. (not talking about the human exploitation that's involved behind).
The hack: Tho_mas hacked his GH2 with the same that I did. It worked for me, it didn't for him, with the same settings. But a different hack worked for him, and maybe wouldn't work for me.
It's all about guessing and hopping it's gona work. No thanks !
Panasonic messed-up with HDMI (mainly I think for strategical reasons). Cameras also have an annoying banding in some conditions.
What else? Oh yeah, the Bloom's hack. He said that because there are no cards currently totally reliable, it freezes after X time of recording. Yes, details are better than with expensive pro cameras, wich is just nothing less than impressive, but if you freeze, what's the point?
So yes, the GH2 is capable of delivering the highest quality file in a small package, but if things go that way, I'd rather sacrifice also the compactness and back to bigger Canon with the old heavy and big cage because I don't want to mess anny more with gear that aren't totally working or that aren't totally ready.
The magiclantern hack for the Canon is a great option and will bring the Canon very very close to what the GH2 is capable of (except for moiré). But at least you don't get those kinds of issues while viewing the footage, or cameras that work for some and do not for others. With the 5D2, you won't ask yourself at higher isos if you could remember the right settings so you don't have the banding in underexposed...
I'm watching closely what is happening and probably won't buy any more Panasonic camera until they got a more serious factory control because it seems to be a weak point there.
More generally, buying low-cost made in China is not a that great idea unless the company demostrate they have a really strong quality control. For the material I've seen over the internet recently, the GH2 is failing, there is a problem, CC totally unconsistent.
I haven't done so far a truth session with the hacked, because testings I'm doing at home are working perfectly, but in the real world stress, it could be another story...if it fails (freezes), I'm going back to Canon as my main video-camera and would keep the GH2 as an HD note-book.
We can't rely on unreliable products.