Hi Felski,
I seem to be having a problem that is a bit of a pain. I'm using Yanfly's Class Change Core as a base to "progress" your class as your level your character. Switching from say the Magician Class to the Warrior Class and checking the Skill tree causes a "symbol undefined" error crash. I've checked the debug log and it says its a problem with Skill Trees in the Window_Techtree_Select andScene_Techtree. Any ways around this that you know of? I've tried changing some of the options around but I wanted players to keep their "previous" Class Tech Trees and build on those, such as Warrior having "WARRIOR1" then a Paladin having "WARRIOR2" and so on.