i'm having the same issue. It's really frustrating.
Did you manage to fix it?
Mac OS 10.10.2
I do not have this issue with any of my Mac apps. It's not normal. Does this hiding happen with any other applications or just AE?
No, it does not happen to any of my other apps on my mac and it does not happen with any other Adobe software like Photoshop, Premiere pro and illustrator. This issue only happens with After Effect CC (this also did not happen when I was using CS6 only since I upgraded to CC (and this problem has been happing before the new mac update to 10.10))
But thats for the comments and if you find a answer on how to fix it please let me know.
Thanks for your time and have a great day.
I've had this problem for a couple of years. Really frustrating. Working with two monitors is really annoying when you want to copy something over or whatever.
Glad it's not just me, though.