Hello!
I have SPS 2013 on-premised environment with AD authentication.
At some moment I've noticed that we have a problem with setting the item level permissions on any lists except the document libraries.
When I click the "shared with" button I see a popup form with a list of users who have an access to that list but there is no "invite people" link or "Advanced" link. Moreover, the "loading" ring rotates instanly like some operation was'nt ended.
The same operation with documents in libraries works well.
I am be grateful for any help!