You guys will like this strange situation, or maybe I am off base. I use the same SSID and passwords for both my router and AP, so my clients roam between them - this has worked very well for me. On both devices I had been using _39, again, all has worked well. With the advent of _40 though, I was nervous about installing it on my AC68 due to all the horror stories of rebooting, so decided to wait it out a bit. Yesterday decided that what the heck, I would install _40 in the AP, and leave _39 in the router. This is where it gets interesting. After installing, factory resets, etc., my devices all seemed to need me to forget the network, and bring it back up again to connect to the N66 - no big deal, I would have done it anyway. BUT apparently after I did that, when the devices "roamed" back to the router, they were confused, and could not connect! My totally unprofessional feel is that the driver that required the "forget" to connect to the N66 was not the same as the AC68, and since they were on the same ssid and password, they were not stored as separate configurations. This problem was very repeatable, and on all of my clients. I went back to _39 on the N66 and all is back to normal - I guess I'll be certain to update both devices with the same firmware in the future, when _41 or whatever comes out. Interesting....