This is probably not V4 related, but maybe i am not alone with this:
viddeo-installation was running fine for 5 yrs straight
then camera broke - fixed with replacement camera.
but somehow also the V4 patch got corrupted - some nodes missing.
strangely the OS saved this broken patch over the old working one.
so i replace the broken patch with a backup,
everything works fine.
but after restart there again is this broken patch, with creation date 2.10.2018 - the day the problem started.
it seems that windows tries to boot into the state saved on this specific day…
i am no real windows expert, any clues welcome!!!