Game flickers as seen here: https://www.youtube.com/watch?v=S8snvQ8A_K0
Reproduced consistenly on 4 different windows 8.1 machines. Issue has not occured on two linux machines.
´The line that initiates the flickering is
Without this line (and the cegui headers) the flickering is gone.
A relatively simple program that reproduces the issues:
hhyyrylainen made a few suggestions back in may for potential reasons of the flickering:
"This maybe an issue with CEGUI's Ogre 2.0 renderer which uses ogre workspaces to render at the right time. Perhaps the workspace priority doesn't work correctly which causes flickering."
"Oh, and ogre viewports could also be a cause, as they don't have a rendering order anymore."
CEGUI log: http://pastebin.com/hdwTTXuD
Thread on forums about the issue: http://cegui.org.uk/forum/viewtopic.php?f=10&t=7080