Seems like only admins and global moderators can change post owners right now.
So if so, you might be able to choose these settings on the permissions screen?
Or even if the button does not show to anyone who does not have this permission.
So one of my mod categories has disappeared. It's available to admins and moderators. No one else can view it.
Trouble is, it no longer appears in categories.tpl. I can access the topics and post, just doesn't appear in the category list.
There is a bug in the category module (in 0.7). As a temporary solution I had to activate all "inactive" categories (and change the permissions on them to be invisible for the normal registered users).
@hek Don't have any inactive categories unfortunately.
Fixed it, set it as a child category, then back again.