Are you serious about this?
Did you saw my previous posts?
http://forum.mikrotik.com/t/radius-server-not-working-in-2-8-11/127/1
http://forum.mikrotik.com/t/radius-server-not-working-in-2-8-11/127/1
http://forum.mikrotik.com/t/v6-42rc-release-candidate-is-released/115077/216
When has a clean config, upgrade occours normally, but when have various settings, the CHR fail to start or no detect correctly the interfaces.
I reported the problems with CHR and when I download a image from MT’s website, I can’t use a new image because the ROS doesn’t boot and show that message “Missing OS”… this isn’t a simple problem from “upgarde”, the image available is a problem itself.
To me, this isn’t a upgrade problem and yes a “Oops!” in the commit of code with problems to the rc branch.