Activity Plus disappeared

Hi there,

I have a very strange problem with Activity Plus. It used to work ok, but today it just disappeared from one group (no buttons for image/video/link). At the same time also the commenting in this group broke somehow - when I try to comment, nothing happens. I didn't install any plugin or do any changes to the system, it just disappeared.

I tried to deactivate the plugin and activate it again - no change.

Activity + still works ok in all other groups.