I think the problem is between diplo mod and whowards dll since only one can be used. I did a build of the diplo mod where I removed the dll and fixed a couple errors. I don't want to post it since it's not my mod, and haven't gotten permission.So is it possible to run Diplomatic mod with CTTP?
I will send you a pm with a link so you can test it out if you like. Just make sure you have Whowards diplomatic features mod as this turns on the required portion of the dll.
I ran a quick test and got no errors/conflicts in logs, but don't have time to play long enough game for trades to run through.