Dolphin, the GameCube and Wii emulator - Forums

When I clicked the fullscreen button and started playing the game, no buttons work, so I wanted to exit the fullscreen mode with alt +enter, but it sayed : Invalid call and then it crashed, so I opened the dolphin again, not clicking anything I started playing a game, and it still was on fullscreen! and it did said Invalid call again when I clicked alt + enter!
What is going on? How to exit full screen fully?