I see what you’re doing now, ok. This is intended behaviour. OnTweenDataTick is only called when using a Data Type tween, like Float or Linear Colour or Vector From/To, etc. When doing an Actor Move From/To, OnTweenDataTick isn’t called because there’s no reason to. OnTweenTick is called instead. I know this is hard to figure out without documentation, my apologies. I’m just a one-man team working on iTween since the rest of my coworkers aren’t involved. I’m working on it!
Is there any particular reason you want to call OnTweenDataTick that OnTweenTick doesn’t satisfy?