i used a vtfedit that was modified to use goldsrc non power of 2 textures but i don't know if thats the reason.
the 8192x4096 texture does work ingame but i don't know if the texture size is really 8192.
Link to the 8192x4096 metrocop vtf - there isn't a alpha channel because i used mspaint
Does the vtf show up as 8k for you?
each time i go back to edit this question all my images aren't there, gamebanana, plz fix.