Settings, programs, expand the windows username, find palemoon rules, double click,expand the menu with the arrows at the bottom and show me the second tab called permissions.
This or go to logs and click palemoon.
Never mind i figured it out. Go to the permissions and deselect Use Different Desktop and DESKTOP_HOOKCONTROL. Now it should work.
Problem is that it doesn't restart when on a different desktop. Will make a bug topic so devs can check it out and also make default rules for palemoon.