I have an island Aumaua with Arms Bearer and I was using all 4 weapon slots. At some point slots #3 and #4 became locked again. The weapons in those slots stayed there (and are usable in combat), but if I try to change the weapon, the slot shows up as locked.
Unfortunately I don't know exactly when it happened so I can't help you with reproducing it. A fix that just restores the slots would be nice...
Screenshots:
http://imgur.com/a/qmm3E
Save file:
https://drive.google.com/file/d/0B8SJB4_B3caPVWxtbkhETUYzbTA/view?usp=sharing
output_log.txt:
https://drive.google.com/file/d/0B8SJB4_B3caPcV9fSDRVNVp1TzA/view?usp=sharing
