My pages with the plugin stopped working in the same way: unfolded no collapse.
I think after a recent update from Jetpack ?
My recent updates:
Flamingo 1 hour ago
Jetpack 1 day ago
Smush 10 hours ago
The event calendar 44min
Wordfence 19 hours
Google maps 20hours
my collapse uses minimal setup and has never been a problem.
Kind regards
Marc
