QuickTime has video but no sound ... ?

[After G]

When I tried to watch the keynote today, there was video but no sound.

Anyone had this or something similar happen to them? Any suggestions would be much appreciated. I did try reinstalling Quicktime and starting Garageband to reset things, but nothing.

*edit* I had looked at and deleted all my text file preferences, but seem to have missed this gem, which decided to identify itself to the system as an executable.

 

[cwedl]

I'm having the same problem, and yes I do not have Mac OSX on mute. Even the A/V control window in Quicktime pro gives sound as grayed out.

 

[After G]

Look in

Your username > Library > Preferences

for a Unix executable file which is called Quicktime Preferences, and delete it. You might have to re-enter your pro registration information, so back that up first.