Thanks, David! I’ll remember this method for later if I get the same problem again. Now I’ve pushed both that file and the mental rotation demo to gitlab, however, the demo does not work online yet (gives just a gray screen). Is this a file or server problem? The experiment I sent above also quits unexpectedly whilst running on Pavlovia (Unable to pull data using git pull (last few days only) as outlined in a comment here too, sorry for the double entry). Does this result from the changes at your server?