Hello Garabta!
Sorry for my delayed response too.
I tried the new ver of GRB_NewGamePlus_MultiItem and none of the menu is changing. I don't know if I am using the plugin completely wrong or if I'm missing something.
I have tried "newgame+ Test1 on" and "newgame+ Test1 on "
-w and w/o space
To figure out where the issue was I even tried just simply remove the "NEW GAME" button but even that didn't work.
This was strange because all that is required for me to do was use "newgame off" and "newgame on". But "newgame off" was not even working.
Is it possible there is somewhere in the .js itself causing an issue?
I sincerely apologize for the inconvenience but for the life of I can not debug this ;-;