Sorry, i deletd the post just before seeing you answer haste - anyway i'll dig the error to learn more and more.
Tbh the main wrong thing was the registration of events that shouldn't have been touched by my addon. The only one i really need is "UNIT_POWER".
Tried relog/reloa/respecs/glyphs and whatever and as expected it works completely fine.
I won't ignore the errors i made, but use them as steps to become better at lua
Any signifcant API change for nameplates? i think it's the only thing i'm missing now.