This is because 0.9.2 do not have any changes on a subject.
So, may be, it is not related to video preview at all? I still do not have any ideas on how those two things can be connected together.
And here I see the issue with YAP UI usability, thanks. May be I should make an option to disable video preview at all or put a delay before video preview popups, to exclude it accidental triggering. Will this helps with your case ?
Some other thoughts. madVR is a black box kind of thing. YAP do not control what device(s) madVR use for rendering. I have no idea, in case madVR use more than one device, did it guaranted, that all of them use the same adapter (GPU). Did you try to mess up with 'Use ... device ... ' options on Rendering/General page of madVR options ? I'm not sure will it help with your case or not, but I guess those options may be related...