I have installed premiere pro cs6 and after effects in trial version. My system in imac 27" 2011 with Lion 10.7.4. My problem is that I have lost the sound system after installation. When I restart my system, the sound icon is gray, in the system preferences/ sound, all is ok, but, ONLY have sound in premiere, or after effects, but in system don´t. For restore the sound, I need unload AppleHDA.kext and load it again. After this, all correct. Sometimes the sound load when the system start (a few) but there is a delay (about 10-15 seconds).