OK I am having the exact same problem.
5.0.13 was working then no communication with anything wireless
purchased new PLM - Nope, this did not fix the issue
30 second reset on ISY and PLM, started from scratch, wireless works and event log level 3 shows communication.
Restore my ISY to the previous save and no wireless showing in level 3? Yet I can write changes to these devices???
I am proceeding with rebuilding everything.