Index: source/BlockID.cpp
===================================================================
--- source/BlockID.cpp	(revision 846)
+++ source/BlockID.cpp	(working copy)
@@ -238,6 +238,7 @@
 		g_BlockTransparent[E_BLOCK_VINES]          = true;
 		g_BlockTransparent[E_BLOCK_WALLSIGN]       = true;
 		g_BlockTransparent[E_BLOCK_YELLOW_FLOWER]  = true;
+		g_BlockTransparent[E_BLOCK_LEAVES]         = true;
 
 		// TODO: Any other transparent blocks?