I am having an audio problem. The RAM preview plays my audio at a lower pitch. I made this screen recording including sound so you can hear it: http://cl.ly/2J471L3v0q3u
I created a new project.
Add an AIF file to the project—but preview the sound clip first so you can hear how it should sound.
Drag the AIF into a new comp.
RAM preview (you notice the delay while it locks existing frames which seems to be another problem http://forums.adobe.com/message/4626528#4626528)
The RAM preview plays the first time through accurately but at a lower pitch the subsequent times.
Mac Pro (early 2009)
2 x 2.26 GHz Xeon
24 GB RAM
I've tried a full restart.
After several restarts and repairing permissions I decided to shut the computer down for a moment. I fired it back up and the problem seems to seems to be solved—at least temporarily.
I take it your sample rate matched between the audio file and the settins in AE Preferences.