Export Premiere CS6 (h.264) - Audio out of sync with several players...

I've had this problem before, but unfortunately it happened again.
I exported an mp4 with h.264 compression. The file plays perfectly with VLC player and everything is in sync. Of course, in Premiere (CS6) everything is in sync as well.
It is also synced correctly with Windows Media Player, as long as you don't 'scroll' or skip parts in the video. If you do that, the audio gets out of the sync...
With QuickTime it is completely out of sync. Vimeo plays it back perfectly, with YouTube it is out of sync...
How is this possible? What is causing this?
I thought that it could have had something to do with the video and audio tracks not being of the same length. I have already mastered the audio tracks into 1 track (wav) and made the same length as the video tracks, before I exported... On previous projects I have have not done that, and the audio was slightly out of sync there as well on Youtube.
What did I do wrong? Any settings I could have done wrong? Is this a bug of Premiere? What can I do to prevent this?

Yea, that sounds plausible but from the other hand, this happens only with (my) exported clips from Premiere...
When I download or watch clips from the internet that are mp4 files with h.264 compression, there is no problem. I just skip through a file of 4GB and it plays back fine. Also the clips from my camera (which are h.264 files) play back fine with everything in sync.
Also, I almost never see sync problems on YouTube.
There is something else going on here... It must be.

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