If you trade anything of yours for gildar (theirs) you will NOT recieve it - in fact you may even LOSE gildar. This is a seriously annoying bug as I cannot seem to sell anything in diplomacy.
example I noticed my neigbour had 0 metak. I offered 100 for 450. Offer was accepted. My neigbour received 100 metal - I LOST x amount of gold.
RAT