Changing the "Item" nbt data of a block with /entitydata that has a damage value (like potions) will cause the block to become un-textured. To fix it I assumed you could just edit the damage value back to 0 by adding ",Damage:0s" but that does not yield any results.
Here is a video showing it in action: http://puu.sh/aJT5u/03155b3c9d.mp4
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
if you want to use other damage values you will need to make new models and textures for that block in a resourcepack I think
Work as intended, incorrect damage value always create un-textured block, then your command to switch back the damage to 0 is wrong, rather use :
/entitydata @e[type=Item] {Item:{Damage:0s}}