Breaking and placing dust doesn't not fix it.
MC-66984
Graphical Glitch with Redstone Dust
Resolved
Duplicate
0
Josiah
(Unassigned)
Unconfirmed
Minecraft 14w33a
Retrieved
This issue has been reported already. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.