I was very surprised by an unexpected issue which is the following: On 14w07a I edited my Chicken Cooker from Dark Oak to Polished Diorite and when I log back on (having changed to 14w08a) I notice that part of it was still Dark Oak. I checked and saw that the transition between the two blocks was between chunk boarders. If I were to place anything withing the chunk it would be deleted upon it unloading. I tryed leaving entities and they got deleted aswell. Luckily I had a chest in the chunk and when I loot an item form it and unload the chunks it duplicates. Also it is just a single chunk effected by this. I tested all the others in my base but all were as normal.
If it is a local issue an anyone happens to know what is causing it please make sure to let me know. I really hope there is a fix for this. Best regards, Doomkaliber.
*Screenshot of how the issue looks like attached
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Please attach the complete output of the "Development console" which can be found on the second tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".

This is on a server. It runs on my presonal machine. I'm running it on a Static IP with Port Forwarding. Here's the scrypt I run it with:
@Echo off
"C:\Program Files (x86)\Java\jre7\bin\java.exe" -Xms1024M -Xmx1024M -jar minecraft_server.14w08a.jar
pause
And here is the output form the server console when I place down 2 blocks of Dark Oak Wooden Planks and log out (unload the chunks), logging back in right after: (more info below it)
[14:32:47 INFO]: Starting minecraft server version 14w08a
[14:32:47 INFO]: Loading properties
[14:32:47 INFO]: Default game type: SURVIVAL
[14:32:47 INFO]: Generating keypair
[14:32:47 INFO]: Starting Minecraft server on *:25565
[14:32:47 INFO]: Preparing level "world"
[14:32:47 INFO]: Preparing start region for level 0
[14:32:48 INFO]: Preparing spawn area: 28%
[14:32:49 INFO]: Preparing spawn area: 88%
[14:32:50 INFO]: Done (2,190s)! For help, type "help" or "?"
[14:33:33 INFO]: UUID of player Doomkaliber is 2171c4ad34f345c4ab87ee1649905435
[14:33:33 INFO]: Doomkaliber/192.168.1.3:49465 logged in with entity id 147 at (459.75766723599855, 64.0, 489.24470375510145)
[14:33:33 INFO]: §0Doomkaliber§r joined the game
[14:33:45 INFO]: Doomkaliber lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[14:33:45 INFO]: §0Doomkaliber§r left the game
[14:33:49 INFO]: UUID of player Doomkaliber is 2171c4ad34f345c4ab87ee1649905435
[14:33:49 INFO]: Doomkaliber/192.168.1.3:49469 logged in with entity id 708 at (453.8389606773384, 64.0, 487.4432998106701)
[14:33:49 INFO]: §0Doomkaliber§r joined the game
[14:33:54 INFO]: Doomkaliber lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[14:33:54 INFO]: §0Doomkaliber§r left the game
I just noticed the following thing: The info that is in the server console and the command prompt are different. The one in the cmd mentions NBT tags which I think is the thing you may be looking for. Since I cannot copy the text form there I will put it as a screenshot in this link: (please dont ask about the username...)
http://s534.photobucket.com/user/Anubirus_Uchiha_Stormrage/media/Troubleinheaven.png.html?sort=3&o=0
I hope this helps.