Hi Michael,

After a lot of trial and error, I was finally able to cause MoI5BetaMay, Dark Theme to change the default "light blue" background color of MoI4 to Dark background color.

Have MoI4 closed, with its default light blue background color.
Open MoI5 in Dark Theme. Load a .3dm object, and press Snapshot in customUI.
Close MoI5.
Open MoI4, which now has Dark background color.

(The opposite color change in MoI4 also occurs. If MoI4 has the Dark background color, and is closed, press Snapshot for an object, with MoI5 in default "light blue" background color, then close MoI5.
Open MoI4. It now has the light blue background color.

- Brian

I think that Snapshot is saving MoI5 background color, and restoring it, when MoI5 is closed, and is also transferring the MoI5 color to the closed MoI4... (or something like that...MoI5 mediated?)

There are about 6 permutations of how Snapshot takes the picture. See CustomUI post #1. I have not tested all of the permutations. Grid might be affected also?
I do not think that the resolution of the snapshot would have any relevance to the color change(s).

Per Max:
Snapshot
-------------
With this addon you can make a snapshot of last clicked viewport.
Resolution is fixed: 1600x1200
Left click - grid is visible
Right click - grid is hidden
Shift + click = resolution x 2
Ctrl + Shift + click = resolution x 3
Snapshots will be saved to "snapshots" directory.

- Brian

Snapshot in MoI4 does not seem to change background color of MoI5 (?)

https://moi3d.com/forum/index.php?webtag=MOI&msg=6507.463