Hi, I have a Macbook Pro with plenty of RAM and processing. For some reason, Apple has decided we need two different Quicktime Players, but one of mine won't work. Any time I get a video for version 10.2 (dark blue and grey Quicktime), everything works great. However, when a video is required to be opened in version 7.6.6 (light blue Quicktime), it will play for about 3 seconds and then freeze eternally. I have tried reinstalling the program, but nothing changes. I cannot change the settings either because if I click on anything, it will instantly cause the freezing. Any ideas why this might be happening or how to fix it?
MacBook Pro (Retina, Mid 2012), OS X Mountain Lion (10.8.2)