I might have had a similar issue a few days ago. I couldn't get my phone to make any sound from the rear speaker (it just kept making a faint click everytime it was supposed to make a sound), but if I made or received a call, I could hear the other person just fine over the ear speaker. I turned on speakerphone during one of these calls and heard the person very softly coming out of the rear speaker so the rear speaker seemd to still be working. I remembered I had recently made some audiopara changes, so I copied over one of the audiopara files found in the audiopara thread (
http://forum.ppcgeeks.com/showthread...ight=audiopara) and it fixed my problem. Hope this helps.