Don't release a bugged software that can't even handle still images
I'm not even trying to do anything with third party plugins but rather just using motion control and lumetri color but frequently Premiere 2018 is having trouble with playback of still images. I'll do something like add a keyframe to control a movement, move it or erase it, and add a keyframe elsewhere, but that old keyframe's effect will still apply even though the effect isn't even there anymore. Also, Lumetri color when applied to a still image (JPG) is causing bugs like the image size to randomly distort.
Ivan Ivanov commented
I've experienced that same issue many times. One thing I've noticed has helped with that is by making the image smaller. The smaller the image, the easier it seems to be for PP to work with it. Unfortunately, that only works if I know for sure I won't be needing the image in its full resolution later on.