Pressing "Back" on first tutorial step doesn't ungrey screen

[Liftyee]

The "Back" button is present on the first step of the tour. Pressing it vanishes the tour window but the screen stays grey, and the "Instructions" button cannot be pressed again.

[Liftyee]

Ahh, now I see that this repo isn't under active development (for a few years...)

I'll keep tinkering on my fork, awaiting a reply here.