It works fine here. Strange.
For me it's 100% repeatable, but can take a while to happen, but always within 30 mins, Have tunnel running in the normal window, then minimize the program and then click on the icon in the system tray and the video just goes dark and the mouse wheel spins, I've let it sit like for over 20 mins , as soon as I click anywhere in the program, I get the app is not responding msg and have no choice but to close the whole program down restart it.
Running in Audio Only mode, not sure if that has any effect on anything.
I've testing it on 3 different systems over team viewer and all of them crash, on Tunnel. Win 7 x64, Don't think it's video card related, because 1 system had an Radeon HD7790 and the other two had Nvidia 750 and 650 TI Boost.
I've turned on logging but it doesn't show anything.....
Is there a debug build I could try?