I just tried changing frequency to Very High and difficulty to Very Easy (though I think that only applies to human to AI trades) and simmed the last two weeks of spring training and still no trades. Looks like it just may be related to my imported league. I'll try the first couple weeks of the season and if nothing then I guess I'll just retire the league and start over fresh with 17.. (this is the first version I've been attached to a league enough not to start fresh but hey I just spent a real life year on this league and never won a championship playing out all my teams games so maybe a fresh start will do me good..
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