System, ubuntu 16.04, running latest quakespasm, quakespasm executable (does not occur in quakespasm-sdl2) lauched from terminal without any parameters.

Replicating the bug:

Upon load of the game, new game is selected. *Just* before the console retreats all the way to the top the tilde key is pressed and the console comes down again.

Here is where the bug occurs, the console, instead of staying down, goes back up. Now every time the console button is hit, the console will drop, then return back to the top.

This also affects other keys, if you then hit escape and go to "new game", when you're prompted "Are you sure you want to start a new game", the game will accept no input.

Alt-Enter is locked, so I can't quit the game, Escape is locked so I can't return to the menu. All I can do is change terminals (ctrl-alt-F1) and kill quakespasm.