Locking this thread for now, separate threads are better from here on.
The purpose of this thread was for problems specific to 2.1 – meaning, package X worked on 2.0.x, but not 2.1. Most of those have been fixed, but packages that were broken on 2.0.x are also likely broken on 2.1 (e.g. stunnel, vhosts, freeswitch) and that's beyond the scope of what this thread is meant to deal with.
I was originally doing triage trying to fix what I could on things to get things in decent shape, but we're at the point now where the package maintainers for items with remaining issues need to step up and fix what few things are left. In the cases where there are no active package maintainers for certain packages, someone with the time/knowledge may have to take them on.