Anyone else have trouble with Quicktime?

[DREWNOX]

I've been using Macs for years and know the software pretty well but I'm by no means an expert. Maybe I'm overlooking something simple but I've not been able to get Quicktime to work in OS X on any of the macs I've tried. This includes my home system and 3 different computers at work. They will play an .mpg and some other formats. But say I'm trying to play a trailer from the .mac website, all I get is the quicktime logo greyed out with a question mark. I looked into this once and was told to trash a couple of files in the quicktime preferences folder but that didn't change anything. Is anyone else having this problem or am I the only dumbass?

[MisterMe]

As there are no generally available trailers that are restricted to .mac subscribers, I presume that these trailers are posted on the .mac web page of a friend. There is an as yet unresolved issue with certain embedded videos and some installations of QuickTime. Without a link to your troublesome web page(s), there is no way to tell if your problem is this problem or something specific to your setup and completely unrelated to the larger QuickTime problem.