Addendum to last post:

Re-read OP's last post about now not locking. Not much can cause both not unlocking AND not locking except maybe a messed up action bar. Misassembly somewhere along the line? When I have a tough one I sometimes follow the Owner's Manual step-by-step as a double check on my work. Then I KNOW at least that part's right and can move on.

The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.