This is a solution, not a problem. Sorry for the subterfuge. I am running Windows 7 I browse the Net and occasionally play some SWF games locally on my computer. For over a year I have not been able to run Flash from FireFox. No other browser had a problem. Each time I tried a FF update, it would work once or twice, then I'd get the Black Screen of Death at the Flash video window. After trying every solution I could find on the net, I finally I did this: I uninstalled FireFox down to the lowest level I could find. Everything in AppData, too ( but there must be some hidey-holes that FF uses for profile data because my bookmarks returned). I also uninstalled Flash. Then, I installed FF 37, reinstalled Flash, and at Control Panel/Programs/Default Programs/(Make a file type always open in a specific program), I SET THE .SWF EXTENSION to Internet Explorer, NOT FireFox. It worked. Success. Hooray! I tried an SWF game, went back to the browser, everything STILL worked. Then I then set the default .SWF extension back to FireFox, played an SWF game, back to FF, and Flash crashed every time. I have since gone through the re-install operation again and have regained complete use of FireFox. I'll leave the SWF files for Internet Explorer because if the FireFox Flash plug-in gets involved, Flash will crash. I hope this is useful. Bill