I went to flash player site and there was update for IE, so I installed it and I had to restart computer so now the video is playing. But it always does first couple of hours, till it crashes, so I can not tell if update helped or not.
It is much harder to open Box with right click when video is playing, but when it happens- it opens the same box in settings. What you mean by "last tab on the left"? You mean first tab on the laft? It is "Privacy". There only 4 tabs in the small box. No hardware acceleration.