I changed the way .setshapename works on players so that add-ons will not be able to use it. Names are still intended to be displayed.
There is an issue where certain add-ons (such as minigameplusplus) define a script function Player::SetShapeName, which ends up breaking the whole thing. This bug crept in because I didn't think it was possible to overwrite a c++ console method like that but apparently it is.
I have added minigameplusplus to the crap-on list (which is now remotely updated when you authenticate), so it shouldn't cause anymore problems but there may be other add-ons that do the same thing.
I will do a full fix for this bug in v12, but in the mean time if you if you're still having this problem I'd be interested in knowing what add-on is causing it so I can remotely disable it. If you don't know what you're doing, you can just type trace(1); in the console, start a game, spawn, quit, then send me your console.log file.