I think he only has the ctp1 textures installed on BSPl. Robbie, when you put something on BSP, you have to put it in paintball as well, a texture, or a sound, because the game doesn't read from bsp. BSP extracts the .bsp file to maps/inprogress and then Paintball does the rest.
So when you get the ctp1 textures, extract them to pball/textures/ctp1 and that should solve your problem. Btw, the ctp1 textures look intercourse ugly in bsp.
And Vague, he said it works in bsp, it doesn't in pball
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Also the grid is what it displays if there is no texture. If you idle round on jump servers you are bound to come across that from time to time as most of the maps are from the Jump Mod.