After activating MPEG-4 my AVCHD clips play exactly as bad as they did before activating it. I even tried to rename the extension from .MTS to .M2TS. It just plays a couple of frames and then turn black. And of course before I get that far, a dialog box comes up and says the format may not be suteable for framebase editing, bla, bla, bla,
I have plenty of ram and speed.
I think the MPEG-4 activation is not working, but I don't know how to fix that.

Any ideas, anyone?