Upgraded to 2.8.12 from 2.8.11 and lost all communication with the ISY. Power cycled several times with no luck. Did a reset still no communication? Finally held the reset button for two reset cycles and could get back in. The about page said 2.8.12 but everything else was back to factory. It was getting late so I reinstalled 2.8.11 and restored from a backup. It is now back up and running as before.
I have installed every firmware for about the last two years and this was the first one, other than the certificate problem in 2.8.9 that has given any problem.
I am back up and running so it was no problem just wanted to let you know that I also had a problem.