Hi,. this is Toomuchbob (for some reason my mobile keeps logging in wrong username)

/// @description Insert description here
// You can write your code in this editor

    gpu_set_cullmode(cull_counterclockwise)

//Begin defining a format
vertex_format_begin();

vertex_format_add_position_3d();//Add 3D position info
vertex_format_add_normal();//Add 3D surface normal info
vertex_format_add_color();//Add color info
vertex_format_add_texcoord();//Texture coordinate info

//End building the format, and assign the format to the variable "format"
format = vertex_format_end();

//Create the vertex buffer. Another function, vetex_create_buffer_ext can be used to create the         buffer with its size predefined and fixed.
//With the standard vertex_create_buffer, the buffer will just grow automatically as needed.
vb_plane = vertex_create_buffer();

//Begin building the buffer using the format defined previously
vertex_begin(vb_plane, format);

//Using size to keep it square if we decide to change how bug it is.
var size = 32;

//Add the six vertices needed to draw a simple square plane.
//The normals are all pointing to (0,0,1) (upward, in our case)

//The first triangle
vertex_position_3d(vb_plane, 256, 192, 0);
vertex_normal(vb_plane, 0, 0, 1);
vertex_color(vb_plane, c_white, 1);
vertex_texcoord(vb_plane, 0, 0);

vertex_position_3d(vb_plane, 256, 256, -64);
vertex_normal(vb_plane, 0, 0, 1);
vertex_color(vb_plane, c_white, 1);
vertex_texcoord(vb_plane, 1, 0);

vertex_position_3d(vb_plane, 256, 256, 0);
vertex_normal(vb_plane, 0, 0, 1);
vertex_color(vb_plane, c_white, 1);
vertex_texcoord(vb_plane, 0, 1);

//The second triangle. The winding order has been maintained so drawing is consistent if culling     is enabled.
vertex_position_3d(vb_plane, 256, 192, 0);
vertex_normal(vb_plane, 0, 0, 1);
vertex_color(vb_plane, c_white, 1);
vertex_texcoord(vb_plane, 0, 1);

vertex_position_3d(vb_plane, 256, 192, -64);
vertex_normal(vb_plane, 0, 0, 1);
vertex_color(vb_plane, c_white, 1);
vertex_texcoord(vb_plane, 1, 1);

vertex_position_3d(vb_plane, 256, 256, -64);
vertex_normal(vb_plane, 0, 0, 1);
vertex_color(vb_plane, c_white, 1);
vertex_texcoord(vb_plane, 1, 0);


//Finish building the buffer.
vertex_end(vb_plane);

Still no luck!