un-use-able chunks

in my none server survival I have an un-use-able chunk
that I have built in but can not use from 1.2.5 and can still not use it to the 1.8 up date and is getting worse because of the area I want to build a horse stable is blocked by the bug plus the area respawnes a chicken and all blocks every time the chunk is unloaded or the game is saved and exited if you want video or the game save I will send it but both are to big to upload