OK, so this has been a HUGE problem for me. It happens often. SO much so, I believed it was my laptop, so I went out and BOUGHT A NEW ONE. As in, top of the line current specs with 16gb ram and 2 graphics cards, and an SSD. The problem often occurs when I am editing a photo zoomed in, and then zoom out. It freezes, and a "bezel" window opens up. I can't do anything, at this point, except shut down LR entirely and reopen. Thoughts?