Thumbnails for GoPro MP$s not working in Adobe Bridge

I cannot get the my GoPro MP4s to show a thumbnail. They are only displaying an icon. I've tried the many fixes available on the forum with no luck (e.g. Use software rendering, clearing cash, restarting Bridge). I've use Bridge to sort gopro footage for about a year with no problems. The older folders that I have sorted still have thumbnails, but this new lot of videos is all icons no matter what I do.

Please help. I'm clearly not the first one with this problem. 

You need to ask program questions in the forum for the program you are using
To ask in the forum for your program please start at https://community.adobe.com/
Moving from Using the Community (which is about the forums) to the correct forum... Mod