Issue resolved. Turns out CKAN is really crippled.
[Log]: [Kopernicus]: StarLightSwitcher: Set active star => Sun
[Log]: [ModularFlightIntegrator] CalculateSunBodyFlux already has an override
[Error]: [SurfaceObject]: Cannot return to original parent, it no longer exists
This has led me to dig around the Kopernicus page; CKAN failed to load the new version with a separate Modular Flight Integrator. Once I properly updated, I got power. Props to Steam user Toasty Buns for suggesting to dig in the debug, and a heads-up to @Thomas P. and @pjf; I've had a similar screw-up with Module Manager today, and a few other mods promptly kicked out updates via AVC.