With the new version 9511, we're experiencing these two problems:
1 - From the web interface (either as an ADMINISTRATOR or as a USER), you can no longer share a new resource (folder, calendar, address book, etc.).
2 - If a resource is already shared, you can't change the sharing settings or delete it.
It seems the main problem is that you can't click the sharing settings in the web interface at all.
The problem occurs on Windows servers (I haven't tried Linux), and I've tried these browsers: Chrome, Edge, and Firefox.