I have been experiencing similar issues to other AE users regarding the Adobe QT32 Server crash problem and have been trying the various solutions posted here on this forum.
I am running a MacPro 5,1 10.7.5 with an AJA LHi card using the recommended System Default Input/Output setting for Audio
The Adobe QT32 Server would drop out as soon as AE had finished launching.
So far I have:-
removed DVCPROHDVideoutput.component from Library/Quicktime
reinstalled the ProApp Codecs
uninstalled (didn't help) and reinstalled (didn't change anything) the AJA Adobe plugins
This left me with After Effects CC running fine as long as I stayed in AE. If I switched the desktop or Safari or any other CC app, then the Adobe QT32 Server would drop out citing CoreAudio as the problem in console.
I have now selected Built In Line Output as my Audio hardware and connected that to my speakers. Since then I have been using AE quite happily for two hours without a problem and I can use other apps without crashing the QT32 Server.
Hopefully this workaround may help others while the main problems are solved.
Thanks for posting your solution, Nic.
We had one other case where this was the solution. We put a note about it at the bottom of the troubleshooting article.