Im using 5.3DR1 Dec 17
TCS 5.3 alpha1
I can use #gassign (gridIDnumber) just fine
I just did today when i was playing with boats
Im not sure why it won't let you use gassign but it is still suported in the code just FYI.
EDIT-- Mattmeck whared your avatar go? I cant fathom seeing a post of yours without it my head is about to explode with the paradox.
