Just following up this post with one of my own, in case the devs haven't noticed it yet!
It seems the "race relations" modifier is broken at the moment - for example I get 0.00 for AI players of the same race as myself (vasari) and a positive (+1.50) modifier with TEC or Advent at the start of the game. On "removing" the penalty via research, the positive modifier with other races drops to 0, and the modifier with other AI of the same race suddenly jumps up (to +1.00).
I'm a little confused by the whole thing, but I think the modifier with different races was intended to be negative, not positive to start, rising to zero on researching the tech, so it actually follows the description. For same-race modifiers, I've no idea if it's meant to begin at zero and rise to 1 or begin higher and rise even more, or begin higher and not rise... given same race interactions are not mentioned in the tech description.
While we're on the subject - why do I now sometimes offer a pact, have it accepted and hear the "acceptance" message from the AI, but then go back to the pacts screen to find it's been rejected/just hasn't worked properly?
Yslen