Hi, I have been using KODI for a few years now, and just switched to Krypton. Went straight from Helix, but no problems 
However, two days ago a strange new behaviour appeared: on certain TV Shows the disc menu is not visible, the screen is black, the sound is there, and the navigation keys are responsive, but I am not able to see what is going on on the screen. (I have a Windows 7 pc, and all my content are DVDs ripped with AnyDVD in their original file/folder format). This only applies to some of my TV Shows, but it never happened before. When I press enter the menu option appear again, but when I press Menu the screen freezes, showing the last image, but the playback actually switches to the menu (I can hear this from the music). Again, this behaviour is new this week, never was like this before.
I made no hardware or software changes to the PC before this happened, but I did try to implement a new learning remote, so I may have sent some unknown command to KODI? Any insights will be greatly appreciated!
Best
Chris