Hellooo! Happy Holidays! Thank you for the game! :D
I can't describe the following bug without mentioning a location; it's one of the very early locations, easily obtained, but still:
SPOILER SPACE
which I'm going to fill with my system details:
MacOS High Sierra, Macbook 2017.
The sub_loc folder, the .app, and the .swf are kept together as in the zip.
I've temporarily disabled the Gatekeeper, or I wouldn't have been able to run the app itself, but I get the bug when I run the .swf file too.
I've started a completely new game, as advised. Everything is new: the sub_loc folder, the app, the swf.
Bug: In location 628, when I press the red button that should take me to an "alternate universe", all I get is a blank screen. The main menu keeps working, so I can quit the game for example, but I can't do any more in-game actions. I'd try to add a screenshot, but it would just be a black screen.
END SPOILER
I'd be happy to provide more details, including a screenshot, if needed. I'm hoping it's just a case of Mur messing with a location file and Liz can persuade him to cease this prank.