@Kest go ahead and disabled quick test parameter in QPlus, then try again. That time you should start on the title screen, then you should be able to push F8. Hit new game and see if it still black screens, if it does this time you have the console out and see if there's an error. If it's a bad event, it would throw an error.
Either way I still need to edit the demo to add in QMovement examples. So I'll work on updating the demo asap, hopefully in 1-2 days.
For QInput, the Menu input was added in 2.1.X. The menu action, by default, is a gamepad only action. But with being able to map keys to actions with QInput, you can make it work for the keyboard as well. For example:

Now I can open the menu by pushing the p key.
QInputRemap, doesn't have the Menu input, since again, it was a gamepad only action. And in QInput 2.1.X I added gamepad support. And QInputRemap still needs a massive rewrite to work better with 2.1.X
On final note, make sure your MV files are 1.3.x+ since these plugins are written based on those versions. So using them with old mv versions might not work.
Edit: Also note that the Escape / Cancel actions will also open the menu