Upgrade from 2.1.1 to 2.1.3 breaks SIP trunks

I’ve upgraded from FreePBX 2.1.1 to 2.1.3, and now my Broadvoice SIP trunks no longer work. My IAX2 trunks still work. How can I either fix my SIP trunks, or downgrade back to 2.1.1?

Thanks!
-mb