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Whenever i try to increase the volume of my system from the tray icon , the volume control bar goes back to its initial position.This behaviour started after I used the volume mixer. Anybody knows what's happening?

Using Windows 7 64 bit, latest SP's installed.

PS: I made a video capture of what's happening, but can't seem to be able to upload it.

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My W7 64bit install does this from time to time, spooky! No stuck keys either. –  Moab Sep 14 '11 at 15:34

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up vote 4 down vote accepted

There's a setting which may be causing this. Go to your sound options (right click the systray icon and click playback devices) then click "Communications", select "Do nothing". If something is triggering your communication channel it'll reduce your audio.

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+1 - there's probably a microphone hooked up! –  Shinrai Sep 14 '11 at 15:41
    
I wasn't even aware that this setting existed! Might indeed be the cause. And indeed, the mic was hooked up. However, when I try to reproduce this, it doesn't "reduce the volume of other sounds by 80%". Odd. Resolved for now, hopefully permanently ;) –  Abel Sep 14 '11 at 15:48
    
Unfortunately, the problem reappeared today and the "Do Nothing" was still selected. Any other ideas? –  Abel Nov 1 '11 at 21:18

Did you check to make sure that none of your keys are stuck? For instance, some laptops allow you to press the Fn Key plus a key in the numeric pad to control volume. If these keys are stuck, then that would cause weird volume control actions.

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Keys aren't stuck up (plus: it isn't a laptop). –  Abel Sep 14 '11 at 15:45

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