When importing .MP4 files, only audio is imported.

Hi. I've been having some problems with .MP4 files. I edit for a Youtuber, so getting it done as fast as posssible is vital. The YouTuber I edit for plays video games, and they use OBS if that helps. Whenever I open Premiere Pro, and drag an mp4 file into my sequence, most of the time I'm expecting to only have audio. When I preview the files, it seems fine. But if I want to import an mp4 file, I have to restart the program and import it. Once it's been imported, I can't import any other mp4 files with video without restarting again. This solution is very tedious and im getting tired of it. I tried reinstalling the program, but that didn't work. If it's part of my preferences, then I may have to reinstall and delete preferences, hotkeys, presets etc-and I don't really want to do that. Is there a solution I'm missing? Please post as soon as possible so I can get over this problem quicker!