Hey there!
Can you paste the error you get from the console when it crashes with the Demo project?
Things are working properly from my tests here, so I would need more info to try and understand what may be going wrong over there.
As for the menu entry not appearing... are you sure the "Enable Menu" parameter is enabled?
If it is not, and no plugin command is triggered to change it, then it will be hidden from the menu (as it should be).