What version of AE are you running (and I mean the full version number down to the last decimal)?
This is version 126.96.36.199
What kind of crash?
What sort of error messages does it pop up? (Exact wording would be nice)
If you could attach the crash logs, that would likely be very helpful.
I will select Ae and the entire computer will freeze until I turn it off and back on. The message states "A graphics problem has been detected." and the usual click here to report language. This is the second computer that this has been happening to me with.
Did the second computer have similar specs?
Does this happen with other version of AE?
Did this happen on computers without Yosemite?
Can you post the crash log?