The recommended firmware on the ZD1106 is 188.8.131.52.15, and 184.108.40.206.15 is a
recommended upgrade path. I have a mix of ZF7363 and 7372 APs, and they
remain disconnected after the ZD upgrade (except for one, oddly enough).
Downgrading back to the 9.6 version fixed it (except for one, not the
same one that connected; it remains disconnected). Any ideas?
When the APs are all connected on 9.6, from Configure::Access Points, AP Policies, check the Limited ZD Discovery box and enter your ZD IP address.
Upgrading the ZD should not cause your APs to change IP address, so after the upgrade, see if you can ping the disconnected AP(s). If so, can you SSH to them, login with ZD admin credentials, and issue a 'set director ip a.b.c.d' with your ZD's IP, then 'reboot'?
This will tell the APs to send LWAPP to your ZD's IP address when they come up again. If they all connected under 9.6, I think they should all reconnect on 9.8.2 as well.
As another note, it may be worth upgrading to 9.7 first, then going to 9.8. I don't think a direct upgrade across two versions is very well supported (although may work without issues in some/most/all cases).