I pressed "r" to restart the game and now get the error message:
############################################################################################
FATAL ERROR in
action number 1
of Draw Event
for object oPrestart:
shader_set_uniform_f argument 2 incorrect type (undefined) expecting a Number (YYGR)
at gml_Script_pal_swap_set
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Script_pal_swap_set (line -1)
gml_Object_oPrestart_Draw_0
I can't start the game at all. Seems to relate to swapping the pallette?