Video/Audio speed unsynced

The audio seems to play at a slightly higher speed than the video in Ae.
You don't notice it in the beginning, but after just under 40 min it reaches a few seconds. It's not relative to where you begin the preview, but to the work area.
No difference between auido and RAM preview.
Some of the material is in the ever-dreaded .mp4 format, but the problem occus for .avi aswell.
The problem is not composition-specific, as a separate composition, with only one 40-minute long avi layer, has the exact same problem.
I have not been able to determine wether it's the auido that's too fast or the video that's slow. It appeared quite recently, so it's not something with the files themselves.
Ae CS6.11.0.0378, I think
Demo version
7,9 g ram allocatable
Win7 proffesional
Only .avi and .mp4, can't tell much more than that
And don't tell me to extract the audio and add it separately. I wan't to solve the problem, not circumvent it.
Also, don't be suprised if i've just missed some obvious part of how it's supposed to work. I'm still quite new to this.

Thanks, dave. Correcting it screwed up my frame-frozen layers a bit, and crashed my after effects a couple of times (with an 17:18 error message that reappeared as soon as I removed it) before I got around to convert some of the mp4:s to avi, but in the end it seems to have worked.
" yes, that tiny-little variation makes a difference."
I'm not at all suprised. In fact, I suspected that it was a centimal or so that was the problem.
"I'd like to know how you're RAM Previewing a clip that's "40 FLIPPIN' MINUTES LONG"
It's really quite short.(Edit: 00:03:16:??) It's just that I accidentally placed it near the end of a 40-minute work area, and haven't found ot how to move the entire composition. Sorry if I confused you.

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Message was edited by: spottedsilvertabby

Hi,
Error 7 is when a router or the connection to the router is broken in some way.
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http://www.4easysoft.com/guide/creative-zen-video-converter/main.jpg
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Welcome to Apple Support Communities.
The behavior you mention is typical of MacBooks with the GMA 950 video chipset and 64MB VRAM.
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Message was edited by: kostby

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http://www.speedtest.net/
Other sites http://www.ralphjohns.co.uk/page5.html#_speedtests
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Hi Skippy,
Welcome to the  Discussions
It is difficult to say what is going on here and three people with different routing devices all seem to have the same problem at the same time.
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