Bluetooth Profile Selector doesn't seem to work with 4.3.1. It can't seem to read the com.apple.MobileBluetooth.services.plist file. I'm going to try to edit the file manually to see if I can reproduce the functionality I had before.
I use it to disable A2DP, which is handy for certain headsets and car kits when you only want to use the headset or handsfree profiles.