Hey, Alberto.
There is a known issue with the latest 2.3 build which affects the passing and calling of referenced functions/methods. This is something which TweenGMS has relied upon heavily. Ideally, Yoyo Games will have a fix for this soon.
FrostyCat has made mention of this over on the GameMaker Community forum: https://forum.yoyogames.com/index.php?threads/gms-2-3-0-beta-announcement.74346/...