I can't make proper stars. I've been playing with the Star Tool by pressing keys like CTRL + Arrow buttons, CTRL + ALT. And suddenly I got my Star Tool broken.
What I have:
How it should be:
The problem is that I got these squares inside my star...
Figured it out.
If you take the Star Tool and go all the way down to only 3 points for the star (first example below) and press Ctrl+Up Arrow Key, you will get that design. Never knew this existed.
To get out of this mode, you need to start drawing a star and press Alt+Up or Down Arrow Key.
I honestly don't know what you did back there to get those lines inside your star but I know a workaround till someone else comes with a more permanent fix for your problem.