I was experiencing terrible crashes in AS11. I was going mad trying to come up with workarounds and just trying to work out what was going on.
I too had my GPU not enabled from the main preference because in the past despite my processor and graphics card it would crash my software constantly.
But there appears to be 2 options with the GPU. You can toggle it under Edit > Preferences (enable GPU). But you can also toggle it under the display tag (located on the timeline window GPU accelerated).
At first I couldn't toggle it under the timeline window (it was greyed out). I was only able too when I turned it on and off a couple of times at the preferences section, then it became active and I was able to go to the the display tag and turn it off.
With them both on my software was crashing. With them both off my software was crashing.
So I enabled it only at the preferences section and not in the display section. (1 off and 1 on)
So far everything seems to be running fine.
I really hope this will work for you. Fingers crossed
