When a local (LAN) player joins my server, they appear untextured, and thus completely white. My player model appears correctly for the other player. If the other player hosts and I join, my player model appears untextured to them, while theirs looks correct to me. (Connecting two instances on the same machine has the same issue.)
A player corpse is textured correctly after the player respawn, though incorrectly ccolored, and the new (live) instance of the player is still untextured. Monster and object models render properly.
Other player is running a different version of Windows with different hardware. Haven't noticed any change after fiddling with GL settings. The problem rights itself after a few map chages, and remains intact as long as the server runs.