A few weeks ago when I pushed a Viper4Android apk to system that worked on Fre3 and disabled LPA om Priest Punch version 1.1, I believe after a backup and a few hours, every app kept force closing.
Restoring my backup didn't work because I made it after I installed V4A and thought things were working.
I'd recommend not disabling LPA. Things worked for a short time, then went haywire.
Using the built in V4A on my test version of 1.2 and not disabling LPA, has been perfect for close to 3 weeks. And I've streamed a lot of music via bluetooth.