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WordPress and all plugins are up-to-date. All plugins other than ICS Calendar, ICS Calendar Pro and Advanced Custom Fields have been deactivated.
When ICS Calendar Pro is activated, I cannot create new field groups in Advanced Custom Fields (not pro): the Add New Field Group page in ACF has a totally different look and entering a title and then trying to save a new field group results in a “Field group title is required” message.
When ICS Calendar Pro is deactivated, leaving ICS Calendar and Advanced Custom Fields as the only activated plugins, the ACF Add New Field Group page looks and acts as it should.
I don’t know when this started, because I rarely have to create new ACF field groups.
Does anyone have any ideas about what may be happening? Is anyone else even seeing similar behaviour?