Guild Wars 2

So when testing Unyielding Anguish on the Triple Trouble event I found out that:
*It does go trough defiance, so you were able to move husks easily
*It ignores unshakable thus making the Wurm Heads in the second phase very hard to kill and unpredictable.

In my opinion as a World Boss Commander for a Large Community, I find that Unyielding Anguish is a crowd control skill and should not go trough defiance, but remove a stack and same with unshakable

So I am a World Boss commander and everytime I go and check TS and I alt+tab out of the game and then alt+tab back into it there is a Black Screen with the windows Window and the ingame cursor wich lags, when I press my windows button or try opening my task manager i see my taskbar but if i try to click on the rectangle in the lower left of the taskbar to go to desktop i doesnt work.

I’ve only started to encounter this problem like a week ago

8GB RAM
Intel i7 3770 3.4 GHz
Nvidia GTX 660 4GB
Windows 7 Pro
Asrock motherboard (do not know wich one)