I had this problem with toribash since 4.6, so I just opened a new client and the crashed one would stay there *no response*. Now with steam toribash(which I've been using since beta) only one client can be running at a time, so I have to restart my PC everytime this happens. Doesn't matter how much I try, with the close button or with task manager, it shows the no response message, asks if I want to wait or to close it, and well... doesn't go away.
Any help about it?