when i compiled my map, i went to a tower that i designed and noticed that the floor texture was missing. i mad the floor out of caulk and just textured the sides that can be seen by the player. but when i got to the tower after launching the game, i noticed that you could see right through the floor. when i pull up radiant, the texture is there. any ideas as to why the game isn't drawing the texture. it's not a custom, it's everywhere else in the tower except for a few spots

try to use shift-H on the sides that can be seen
if that doesn't work
try to remake the texture without caulking it
if that doesn't work
use space the a the same brush but then a bit higher and/or lower
if that doesn't work
ran out of ideas

and make sure you texture your walls/floors ect with a texture like this eg:

wood@wooden_door

it has to have the @ symbol in it to make it solid

gd luck

this can also happen if patches pass through or intersect brushes, and as well if you have too many brushes intersecting brushes