I think this is an old problem, but I'm wondering why it hasn't been fixed yet.
While running AE, the Mac OS console is absolutely flooded with this error message:
After Effects: -[NSMenu menuID]: unrecognized selector sent to instance 0x116915050
Not sure if it's a problem but it doesn't seem right to me. We are troubleshooting some freezing issues we're having but we're not sure it's related to AE or this in particular.