when fences or cobblestone walls attach themselves to other blocks it has a glitchy texture, when one side of the texture is invisible and you can see through, fences connected to other fences and walls connected to other walls are unaffected.
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OK thanks I din't know about 1.4.2
Your welcome 🙂
I think it as been fix in Minecraft1.4.2pre ...
EDIT: Yes it as!