Has anyone else noticed this? I was playing with another player versus 9 AI in a multiplayer game. (Tech trading on/brokering off.) I was playing with customer faction using the Torrian tech tree, he was using something based off the Terran or Thalan tech tree.
He has free research points took hives and part way xeno commerce. I started researching universal translator so we can trade 
Finally I get universal translator we attempt to trade. I trade him successfully universal translator, however, all tech's he has unlocked I can not get and he can not trade me. hmmm... okay maybe just something in the game where because the techs are named different I can't trade, other techs work fine but, maybe not the beginning ones.
At this point he researches xeno commerce and interstellar travel (both I have in my Torrian tech tree as well). He attempts to trade, these techs are not available to trade. Why is this what's going on? I'll take a look at the xml's tomorrow to see if I can see anything that jumps out at me but, something appears to be broken here w/ the ability to trade techs to the Torrian tech tree.
Note: both interstellar travel and xeno commerce he researched himself and did not obtain via trade w/ another faction so brokering is not playing any effect here.