Quote Originally Posted by Slaists View Post
Could it be that 1) you do not produce anything they need/lack at the time; 2) their trade routes are blocked?

I usually see everyone I have agreements with in my list though.
Unfortunately not. I have goods a plenty to trade and none of their parts are blocked.

One other thing I noticed - sometimes trade agreements are cancelled by the AI without notification. Usually I get the two screens (1. "trade with you is no longer fun" ;-) and 2. "Trade agreement has been..."). Sometimes these notifications are missing.