[BUG?] Can't switch Thruster-, Hoverball- And Dynamite Models.

Since yesterday I can not switch which model I use, And I am stuck on having to use the largest thruster in my game.
Also when i succeed to select a model it can not be placed nor seen when the tool is in hand.
This is NOT about the wire thrusters btw.
Can anyone help me with this? Thanks in advance.