Spoke too soon... actually, if you still have medium reactors then you definately need to use the latest files posted below. Your components file is out of date. Also, if the reactor is not on every ship built (before the 3rd engine is placed on board) then you are using an older AI_Design file. Both these files and a few other corrections are in the Zip in my Last post. Try loading them in and seeing how they do
So far, in my test game, I have been spreading as quickly as possible, and was pleasantly surprised to find the Narn, Vorlons and Yolu around me - all with quite a number of worlds setttled (I know it is rather UnVorlon like, but we can work on the Ancient races more later). The Narn were beligerant and went right on the offensive, the Yolu wanted trade in a bad way and the Vorlons... politely asked me to get my ships out of their system before they were 'accidently' lost.
With all luck the next set of revisions to the base AI will get me far enough that I can start some basic AIs for each of the races (would prefer to see the Narn using Narn weapons instead of the same old BLast Guns everyone else is using).
Anyway, back to work