Opt (alt) and full stop, as noted above 
It could also be that it has to finish up the current task, and on a non-SSD system you then have two problems. One: It takes a while to do anything. Two: It may be so taxing that it simply fails to respond to clicks. I’ve had this a lot in the past, which is why I just sold the dog and bought an SSD.
(Not really. I didn’t have a dog. I just robbed a bank.)
Alright, I should have seen that! Thanks!
Seems reasonable! SSDs. So many upsides! Probably have to get one soon.
We’ll have you a full member of the Cult of SSD soon enough.
Most likely!
I was able to set “About Unity…” to cmd+B and it overwrote the Unity shortcut for building. Very nice!
It still won’t work for preview’s export function, though. I don’t know what’s that about (getting the Mac OS error sound).
It’s a weird one, but you can circumvent it by setting the shortcut for all apps instead. It’s probably better to have a consistent shortcut anyway 
This actually works now! Thanks for the help! 
When I first touched Unity 3.3 back in the day, Mono would crash if you pressed Ctrl-P while in Mono (which is “Play” in Unity).
I think that bug lasted until Unity 4… maddening.
I learned not to fairly fast.