I had a video I was playing back suddenly stop, followed by a sad face. After which the resolution was no longer 1080p. When I went into settings to fix that, the resolution changed several times, and each time, asked me if I wanted to keep the new resolution. (I had not even seen the system settings page I was trying to access at this point). After declining all the offers to keep the new resolution, the display settings page was finally shown, but resolution entry was dimmed out. I chose to reboot, and was happily back to normal - my TV’s OSD confirmed 1080p 30bit when the OSMC GUI came up.
Other than that (and the resolution being skew-whiff immediately after upgrade) I have experienced no problems not associated with add-ons.
Thanks for your efforts with this.