Vista has a tendency to do that, some programs can automatically switch between headphone and speaker mode, others give you the option to switch between outputs (winamp for example). And others are just funky, I've yet to get IE to work right, one day it'll switch between modes fine, others I have to restart it. So far nothing has fixed all the problems, all I can say is that it seems to be getter each time a major update comes through. When Vista first came out I would have to restart my pc for it to switch between headphone or speakers. Just try and do the whole driver reinstall and hope for the best.
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