94 Camry AC Problem

For some reason my two center AC vents have closed, the far left drivers vent blows air and so does the far right passenger vent.

any suggestions as to why this has happened and how to fix it??

I'm having this same problem and someone else just posted it too. See my reply in this thread:

http://www.automotiveforums.com/vbulletin/showthread.php?t=446441&highlight=Camry+air