Thumbnails not showing up in Bridge, tried everything recommended

I have a new PC running Windows 10. My thumbnails were showing up in Bridge until I went into preferences and changed the background color to a lighter grey. Then, they stopped working. I can only see the CR2 sybols in my folders.  I've uninstalled and reinstalled Bridge, installed two earlier versions, retarted my computer, re-checked and reset my preferences with my second computer's Bridge settings, increased the "do not process files larger than..." and everything else I've found on this page and the web. I am currently in the newest CC version of Bridge, but I've tried three different ones. I am very frustrated. Please help.  

Can't figure out how to delete this, but I read a new post and realized it was b/c I had gone back to the earlier version of ACR. I followed the Bridge recommendation and that worked...