fence bug http://i.imgur.com/EZFWT.png
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duplicates 1
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This appears to be the same issue as https://mojang.atlassian.net/browse/MC-461 https://mojang.atlassian.net/browse/MC-446 and quote a few others.
Confirmed on 1.4.2-pre - the fence appears graphically glitched at the angle described in the picture.
Attach the picture the OP linked to.