Happened to me 30 mins ago in a multi match. I don't know exactly what caused it but I know how it happened. It's definitely a Flash beta/Chrome combo platter. After reading in this forum about the Flash beta I uninstalled the version I had, DL'd the beta version and installed it.
First match everything looked good-nice and smooth, everything on like usual. Second match, second hole bang-big white screen with the yellow warning. Closed the browser and tried restarting but that wasn't happening in Chrome. I opened FF and finished the match that way.
The Flash site doesn't include Chrome in their browser list and my guess is that the 2 don't work right together. Somebody please correct me where I'm wrong or point me to the solution. My workaround is going back to what I had before I screwed it up. LOL. TY