Hi,
I too have been experiencing similar problems, and am working with a Blackmagic card. I've been trying to troubleshoot - last night I thought it had something to do with Red Giant colour look plugin, as things improved after I removed these filters, but then this morning Premiere wouldn't run for more than a minute without crashing with these filters removed.
AE seems to work fine, using blackmagic playback.
I haven't tested the project with blackmagic playback turned off - I'll give this a go and let you know the results.
I've been receiving the same error message
Ok - update, I was using driver 9.5 - now have upgraded to 9.5.1, it's a little hard to tell, but it seems that the project file that I was having the problems with continues to be a problem - will let me work for a little while, then crash. I've started a fresh project and imported a range of footage, including some from my problem project, and so far so good. I get playback fine on external monitor, and haven't yet crashed.
Have you tried a new project? or are you continuing to experience problems with the same one? I kept having problems even when using copies of project. I also started a new project and pulled in old sequence, and the problems began again.
Turning blackmagic playback off - still gave me problems in my "problem" project.
My new project seems to be working for now with blackmagic playback both on and off.
Hope this helps - I'd be keen to hear of your progress.
Myles Conti
Director Conti Bros Films
http://www.contibrosfilms.com