One change noticed w/ 1.20... I have AT&T Callvantage VoIP (DLink 5102S), and over time, in the quest to tweak VoIP quality, I had tweaked DIR655 settings. This originally started with some port forwarding, then putting the VoIP adapter in DMZ. I realize having both of these configured simultaneously is redundant at best, but v 1.11 did all right with all of it.
I upgraded to v 1.20 this morning, and the AT&T box was the only thing I couldn't get to work. Saw a few DIR655 log messages referencing the VoIP's IP address and a dropped ICMP, but nothing specific enough to help me get the AT&T working. I finally turned off the port forwarding rules, and let the AT&T box just sit in the DMZ, and that finally got the AT&T working. All of this makes sense from a logical POV (it should either be port forwarding OR DMZ), but like I said, 1.11 handled the contradiction, while 1.20 didn't. I also have some QoS rules set up for it, so I'll have to see over the next few days if those are still working.