in the last few days I have seen threads similar to this:
Arbeiten mit After Effects 2015 CC nicht möglich - use translate to see the user describing white screen
all windows 10. different GPU's.
sounds extremely frustrating. I would waste no more time and contact support. they can help you on the phone with also remote access to your computer and figure what's wrong. Contact Customer Care - follow the windows through until you get a number, chat and please update the thread on whatever they may find. Good luck!
Ok, so yes, in this post (Arbeiten mit After Effects 2015 CC nicht möglich ) he also mentions that where you would go in the Preferences pane for After Effects, under Previews (second from top of prefs), then to the right, if you click the box for GPU Information..., where it says Ray Tracing w/ the dropdown, my GPU option is also greyed out, and only allows to select CPU.
My graphics card is recognized though.
So we have that in Common, as well as both on WIndows 10 Home 64 bit, and using 64 GB of system ram.
Glad it isn't that we both have same video card, as it seems hopefully an AE issue, and not a graphics card issue.
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I think this actually may be an external display issue, for whatever reason, after I disconnected my only external monitor (Mini Display 1.2 connection - Display port on the Samsung) 34" Samsung S34e790c Monitor, my AE is behaving more stable. Double clicking on source footage, is now behaving properly. I really would like to use my external monitor, but right now, I have to get work done on a 17" laptop display until I find the solution.
I have the same problem with dual monitors but when I disconnect one the problem is gone.
My monitors only have DVI & HDMI & D-SUB connections. I wish I could test the display connectors somewhere and see if that might do the trick since they are similar connectors and my titan X has 3 of them for ouput. Hopefully NVIDIA & Adobe can look into this as many video editors use dual monitors