IOS 4.3 upgrade loses call audio iPhone 4

Ive not seen this one in the forums yet, but if its there and someone can point me to the thread thatd be great.
I upgraded my iPhone 4 (AT&T) to iOS 4.3 a couple of days ago. Since then, whenever I get a call, I cant hear anything on the phones earpiece. I have to either (a) use the speaker or (b) use a Bluetooth headset.
Anyone else got this problem? Its insanely annoying, and Im going to have to roll back to 4.2 because of it.
Message was edited by: MerrymanLyon
IPhone 4 (GSM) iOS 4