Hmmm, that's strange. With left Ctrl + left Alt + left and right Arrow, i can move the Pathes slowly. Did you try it a bit longer? It moves REALLY slow, so you maybe didn't notice the Movement. What you could do, as a Test, before you start the DevMode, rename the ModDevs player.JSON into player_Backup.JSON for Example, to get a fresh one generated when you start the DevMode. Does it work with that?