Resently when using large file like over 25 MB, my monitors have blacked and only way out has been to unplug computer and start again. That has never happened when file has been small. Sometimes blackening has been shortly after opening the file like today and few times after longer period. When my version was test version PRO program was running OK. and with version 2014 there was never similar problem.
Timoko
I would suggest you update your Graphics Card driver.
It is your graphics card driver crashing. Let’s hope an upgrade helps. I once had a similar experience, but in the end the graphics card turned out to be at fault, and it blacked out completely.
Anssi