Quicktime - Cannot stop or save a recording

I just tried to make a screen recording using QT. The player appears on screen and using the File menu, I choose new screen recording and then move the mouse onto the screen I want to record and click.. the player then completely disappears from my screen when the recording starts. The only way to stop the recording is to hit quit from the quicktime menu. This is the first screen recording I have tried to make since updating to Mavericks and it's also the first time I have had this problem.

Upon restarting Quicktime my movie shows up so I can save it.

Any ideas?