Every time I minimize the GUI whith the minimize button "_" in the right upper corner of the window, the program disappears. If I click on the TS3-Symbol in my taskbar, nothing happens, and no preview of the window can be seen.

I still can talk to others and hear them, but no chance of reopening the GUI. As long as I click somewhere else on my desktop or onto another application like Firefox, there's no problem. The TS3-window disappears, and when I move my mouse over the TS3-symbol in the taskbar, I can see the preview of the window and open the GUI by clicking on the symbol. I made the symbol sticky on the taskbar.

I use the Win64 Client and have Windows 7 Professional 64 bit as OS.