My machine does not have enough memory to play with that many opponents, Seilore, but I would like to confirm with you that this is a separate problem from the one where after you change status (for example, make an alliance treaty, or declare war) such that the position of the parties changes, you get a corrupted display until you exit and then re-enter the diplomacy window?
Yes, this is a separate issue, you can exit and re-enter the lobby as much as you want here... Now if you meet another faction than it will fix itself by adding another circle.