I saw the 0 power thing again at some point, but I have no idea what it could be related to. At first I thought it was because my enthralled died, but I just tried to replicate it but it didn't happen, so I have no idea what causes it. Perhaps some power has a positive power cost by accident which pushes the power amount to infinite or something?
Ah, so that's what the military threat multiplier means.
No need to rush on the bugfix, take all the time you need. At this point in the development cycle, these are minors bugs as far as I'm concerned. The idea is to test out interesting stuff, right? Better focus on that stuff, since fixing bugs is kinda pointless if you intend to change things at a rapid pace. A fix today will be pointless if the system is changed tomorrow. :)