This is a mashup of two posts from the community forum:

Loading RED footage into the source window is constantly crashing Premiere for me.

Currently running:

Core i7 7820x @ 3.60GHz
32 GB Ram
GTX 1070

The Red footage in question runs no problem in Media Composer, Red Cine-X Pro, and DaVinci Resolve Studio at a full debayer in real time. Most of the footage is either UHD or full 4K at 23.976fps. I'm cutting a feature and this issue is preventing me from finishing and may necessitate a move to Avid.

When the RED footage is in the timeline there doesn't seem to be any issue. I've tried troubleshooting for several months doing all of the obvious steps with no luck.

Update:
So after months of trying to figure this out I just had a breakthrough moment:

99.99% of the time I will double click on a clip to load it into the source window. I just happened to click and drag a RED clip into the source window, which I never do in Premiere but sometimes do when working in Avid. For some strange reason I can't quite figure out, all of my RED footage loads and plays in the source viewer when it is dragged into the viewer.

But Premiere will still crash if I double click on a RED clip. This project also has a lot of Alexa, Varicam,and GoPro footage in various sizes and frame rates all working flawlessly. So the problem isn't gone, but it appears I have a workaround for now.

My fear though is that this will only be temporary, as I was editing the RED footage will no issues until this problem suddenly arose. It has nothing to do with program versions or drivers as far as I can tell. Just that after months of using the footage with no problem it was suddenly breaking Premiere.

If anyone can shed more information on the problem it would be very helpful as I can't narrow down what the issue is.