Hey,
Thanks for the bug reports. Obviously we playtest, but don't have the time to do exhaustive analysis like a real game studio would, so it's great to receive feedback from the players.
We've recently changed how data is read (it's now read from a text file, so the players can alter values if they want to fiddle with stuff) so this may be causing issues. Unsure why it would have cost 0 power, we've never seen that, but we'll look into it.
Information blackout needs to be reworked, along with the information system being rebalanced. It's got a set of minimum values, which information spread can't drop below, but it hits those minimum values a bit early, so the ability doesn't do as much as it should.
The military strength threat multiplier is comparing your nation's military to the other nation's, so it'll remain the same for everyone in a given nation. It should be taking into account their current military and also their maximum military capacity.
We'll try to get a bugfix out as soon as possible, to correct these issues, before we start looking at Version 4.