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.
When i set permissions on a category, it creates new groups (cid:2:privileges:g+r and cid:2:privileges:g+w)
have a look on my category permissions :
I noticed the same thing today after a git pull
Please update to latest, I messed up @ https://github.com/designcreateplay/NodeBB/issues/992 so we will refix this one properly by hardcoding administrators and registered-users to be visible only
Haha hey, I just noticed you threw in a [Solved] tag into the title. Nice touch.