I dont run tweaking applications, especially not those that would require me to do tings that remove the security code i use exchange and cannot go down that route. So - no, havent done any special tweaking as far i know. You presume a lot .-)
Too bad you have no hunch where to go and troubleshoot.. .. VI editing files, that i could do, reflash? no. sorry heute nicht.
/sbin/stop xsession/sysuid && /sbin/start xsession/sysuid