Using 5.12. Every once in a while when I start REW the splash screen comes up and goes away as usual and it displays the initial screen, but it freezes at that point indefinitely. I cannot select any of the Menu items and I cannot click X in the top right corner of the window to close it. I have to kill it with Task Manager and after a little bit it terminates. Then I relaunch REW and its fine. I've seen this now a handful of times. Not sure under what circumstance it happens.