Not that I can tell. It appears to be completely random. Sometimes it works and sometimes it doesn't. Sometimes after a few seconds it works fine, sometimes it doesn't work fine until I add the clip to my sequence or I restart the program. All of the clips are the same file type recorded on the same camera with the same settings. I originally just chalked it up to the Macbook because it seemed a little underpowered to be running Premiere, but now that I've started working on the new PC that theory is out the window.
It would probably be easier to diagnose the problem if I could figure out a pattern as to which clips would do it and which wouldn't, but alas it seems entirely unpredictable.
I may as well throw in that I'm using the software with a Creative Cloud subscription. I don't see how that would make a difference, but just in case...