List stopped scrolling?

I have been using a list box (jqm) for a year or more and never had problems with it scrolling.
Today it stopped scrolling and I can’t figure out what I did to make it stop.
Does anyone have any experience with this?
I know jqm is obsolete, but it worked an hour ago.

Have you checked for messages in the console?

This was the problem: I changed the design height of the main screen (not the scrolling screen) and that made the scrolling screen stop scrolling. I set it back to the original size, and I am able to scroll again. Not sure what one screen has to do with the other but it is fixed now.