I found a bug in the snapshot 13w39a. the leaves of the trees against version 1.6.4 are very transparent, too transparent, when graphics are on fancy.
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This is not a duplicate, and is confirmed on 13w39a. The opposite sides of the leaf block you are looking at do not seem to be rendering making the leaf blocks more transparent. This happens with all texture packs.
Duplicate of MC-32008
Duplicate of MC-32008
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