Fission reactors no longer work w/generator?

[kurdain]

So I had several sub-assemblies that I have been using for a while, now suddenly today I get the 'Generator Shutdown: No reactor available".
There clearly is a reactor available, it is connected directly to the thermal generator, nothing in between. These were working assemblies until today.
This seems to affect all the FISSION style reactors, Garnet, F.L.A.T., Excaliber, Prometheus.

I put a molten salt reactor on it and the generator works.

I noticed that there was some sort of file that Steam updated today, CKAN shows no mod updates.
All I can see is that Steam downloaded something for KSP, I can't tell what.

Did something get patched today that disabled the ability of fission reactors to generate power with the thermal generator?
I think I see the fission reactor generating electric charge, but no megajoules due to the generator disabling itself. 

 

Ideas?

Thanks,