I saw this post: https://theme.co/apex/forum/t/accordian-is-not-collapsing-after-cornerstone-update/25904
I have the same problem (accordians should only open one item at a time, but multiple items remain open instead), but everything is up to date. Cornerstone 3.0.4 and X Theme 6.0.4.
What can I do to fix it?
Thanks,
Dean