Mac OSX (Mavericks Developer Preview 2)
World of Warcraft Version 5.3.0 (17128) Release x64 Post Patch 7/2/2013
When Mumble is running, now WoW quits. Here is Blizzard's diagnostic ID: 63A85162-5EDB-43DE-89CE-8D4F67676D18. I can't find any logs to provide details. Blizzard's error reporter only provided that reference number.
Mumble/WoW worked fine before the 7/2 rolling restarts.
Reporting to WoW as well, but wanted to let you know.
I do not know, yet, if this is a Mountain Lion issue or a Mavericks one.
Interesting note. If you launch WoW before Mumble, everything works fine. If you launch Mumble before WoW, WoW crashes.