Hi @C-son thanks very much for your update! I’ve updated my installation of the module and given it another try, and it’s definitely better:
my mirror now shows the picture from MMM-BackgroundSlideshow ok (instead of just the black background with no picture under my other modules that I was getting before when MMM-MagicMover was enabled)
watching carefully I can see my displayed modules (e.g. default Clock, weather modules) getting shifted slightly in the mirror display every now and again
but my module at position: bottom_centernow gets displayed shifted to the right of the mirror. I have MMM-WeatherOrNot displayed at this position, configured to show a 7-day forecast as a horizontal row of icons, and the last 3 or so icons (perhaps 40% of the whole row) is shifted off the right hand side of the screen (if that helps give you an idea of how much it’s been moved across).
I do have a module configured to display above that (at position: lower_third) and below that too (at position: bottom_bar) and they both appear displayed on the mirror normally (i.e. centred like I’d expect)
I still have MMM-MagicMover configured at position: top_bar, just in case that makes a difference.
Let me know if there’s any more info I can help with anyway, happy to try it out.