Problem solved. I started to look at the errors in the inspector in Firefox, and then it occurred to me that I didn't update my template files in the extensions folder along with the rest of the site. So I did that for the style and javascript folders, and found a number of discrepancies - either updates not updated and/or errors on my part. I've brought the custom template files up to date, and that seems to have solved the problem.
Thanks for pointing me in the right direction!
Thanks for pointing me in the right direction!
