Okay, so I should (in theory) be able to reproduce the freeze, since I am also on Windows 10 64 bits. Thanks for letting me know, I'll look into it! And don't worry about not knowing where it was, I'm just trying to pin down what could be causing the problem. Knowing it was before the 3D stuff really helps a lot!
I have a update coming soon that fixes several smaller bugs with the game, and I fixed what I think was the problem with level 4.1, so maybe it is fixed now? I'll see if I can reproduce the freeze in the current version, and then I'll see if I can replicate the freeze in the new version.
I will look in to getting a fix, if the coming update does not already fix it. Thanks again for the help!