Ok, I'm working on a new game (can't tell you what it is yet

) - and everything has been going pretty well -- except this:
what's up with my cubes?!? The terrain is fine... but the edges of my cubes are friggin' weird. If I get close enough to them, the problem dissapears, so I'm thinking it has something to do with depth-testing, disabling texture mapping doesn't help, or lighting, or basically anything i've already got glEnabled -- got any suggestions?
thanks