There indeed seem to be some issues in multiplayer in 4.11 and 4.12, i started working on update , as well as server/client versions of all the main commands, regarding the HUD, the sample HUD indeed isn’t multiplayer enabled, but I assumed people would make their own HUDs. so i did not bother going deeply into it ,and when I added multiplayer support (which works as long as you call the functions on server, thou you have to do that yourself) I forgot to adjust the sample HUD to work with it.
I’ll have an update ready in day or two, which will include compatibility update for 4.11 and 4.12, as well as hud adjustment and making sure it works with multiplayer out of box.