I recently bought iMac 21'' and I am still in adaptation phase.. I am using VLC player for playing .avi and .mkv files. I never installed any codecs or something like that... I only DLed VLC player... I have noticed that in some of the sequences (like scenes with a few colours - dark night / open sea, or credits in the beginning of the movie, especially when it comes to animations...) movie is always cutting during the playback.. It's never happening except in these situations. I ignored this problem in the beginning but now I thought someone could help me with it ... I hope someone will understand what I am trying to say. Thanx in Advance.