Dear Gordon Berry, We had also faced after rebooting the SZ100 , the same kind of issue it might be a data plane communication issue, In my case, Those not showing AP's can allow clients to associate it provides internet, even i can able to SSH on those AP's but it wont be visible on SZ, I raise a case they run some command on debug mode, Then it resolved,Dont Reboot the controllers again, it might leads to some other issue, Kindly raise a case & all the best.
regards,Arun -
arunkumar.mani@freshworks.com