NEW LRC PROBLEM

I use Bridge to organize my files, but since having to pay for a subscription, it no longer reads my video files.  So Lightroom Classic 12 can.  But now I played several videos, rated in Bridge and then an empty white box appeared while playing a video which just stopped.  It is caused by/related to LR, as I could no longer do anything there and using task manager closed it and the box disappeared.  Then I went back to LR and the same thing happened again.  Only now Task Manager doesn't show LR so it can't be closed.  I played the file to completion in Windows media, but now it looks like I'll have to reboot.