not sure if this is triggered by anything, but most recent update, modules are no longer being added or removed from machines automatically, nor are a right-click remote remove, Red X remove indicator being applied either.

As I lack construction robots, this must now be done totally manually, so this is presumably a bug.

Just checked. No issues with remote insert and remove on a platform. Must be some mod conflict.

Checked on the current version: the platform inserts requested modules and deconstructs marked buildings on its own — the mod doesn't touch that, it only restricts building on planets. Looks like a mod conflict

Hmm. I disabled everything but the 4 required mods (Space Age, Quality, Rails, Spacefarer), and the bug remained. A new world works fine though.

Uh, I seem to have both mod and user scenerios space start for some reason. Not sure if you changed something or something went weird.

Save File:
https://drive.google.com/file/d/1W_kreWqEuY7M2_g_3v9whCIU_cN1p6g8/view?usp=drive_link
About 10 autosaves earlier, the problem didn't exist. And doesn't exist on loading it.
https://drive.google.com/file/d/1JwaAMAvCY5j77j0YE-BES3nksjTl6F3c/view?usp=drive_link

Ranakastrasz, thanks for the save, it showed everything. There is a ghost of "Belt immunity equipment" in your armor grid, a request to install equipment. In vanilla, construction bots fulfil it, and there are none here, so the hub keeps it first in its queue and never gets past it: while it's there, the platform neither inserts nor removes modules anywhere. Remove the ghost from the armor grid or fit the item by hand, it's in your hub, and modules will work right away.

Fixed in 0.9.125: the mod now removes such ghosts itself, with a message.

well that explains it. thanks.