In my current game (started with 1.8, opt-in-hotfixis activ according to steam) I'm sometimes unable to trade certain strategic resources to some factions.
Let's say I'm trading with the Terrans, i can select and trade alle resources I have - durantium, thulium, antimatter, elerium and promethium. In the same turn I trade with another faction, for example the irdium, and I can only select durantium and thulium, the other resources just don't show up, and yes, I still have enough of them available.
So far I can't see any logic or pattern behind that behaviour. I don't think it has something to do with the relations, because it happens with factions that totally like my and the resources are not greyed out, they are missing at all.
Anyone knows what is going on?