Hasta La Motion!

Sorry if the title is annoying, but I guess im pretty annoyed.

I have quicktime player Version 10.0 (118) running,

as well as

Quicktime Player 7 Version 7.6.6 (1710) running.

And lately I wanted to try this : http://www.vfxtalk.com/forum/you-fix…ue-t13215.html

And then when I opened up one of my Canon 7d mov files (h.264) with Quicktime player 7, it crashes and I get the error “Quicktime has crashed unexpectadly while using av1decoder plugin”

I’ve looked everywhere and yet cannot find a solution, anyone else had the same problem?

When-ever I try buffer any quicktime videos that are hosted on a web page, it crashes firefox. In safari I get an error, and in Chrome nothing happens it just stays black screen but I can hear the audio.

Any ideas?

Thanks!