I may have found an incompatibility with K2. But specifically with Cargo Ships as updated recently.
"Message reads:
Failed to load mods: Error while running setup for entity prototype "solar-panel" (solar-panel): next_upgrade target (el_solar_entity) must have the same bounding box.
PostScript: The mods it suggests removing were: Krastorio2, combat-mechanics-overhaul, 248k-redux, and squeak-through."
I reported it over there and they suggested reporting it here. Currently I'm finding out how to get logs for with their mod and without their mod enabled.
PostScript: If it isn't this mod I will post under the other two (combat mechanics and squeak through) to see if they are causing it.