Ctr+Alt+Shift+N = Crash

[chrisbrearley]

This should open up a new compostion window and lock the old one. Having done this succesfully for many years, it now doesn't. Instead in makes AE crash. Before it does the pointer changes to a camera icon. Not sure what that's all about.

[Rameez_Khan]

Hey chrisbrearley,

Sorry to hear about this!

Please provide more information so that we can help you: FAQ: What information should I provide when asking... - Adobe Support Community 

Thanks.

Rameez