Index: code/graphics/gropenglstate.cpp
===================================================================
--- code/graphics/gropenglstate.cpp	(revision 11274)
+++ code/graphics/gropenglstate.cpp	(working copy)
@@ -218,6 +218,7 @@
 	}
 
 	if (units[active_texture_unit].texture_id != tex_id) {
+		glBindTexture(units[active_texture_unit].texture_target, 0);
 		glBindTexture(units[active_texture_unit].texture_target, tex_id);
 		units[active_texture_unit].texture_id = tex_id;
 	}