I was building the Capaldi TARDIS (2015), and had a design for the room. To make the blocks place in the right area, to create show accuracy, a bookshelf (tall) must be placed on an angle. But the bookshelf is only being placed at the normal 90 degree design. Is this a bug?
EDIT: also, blockdata rotation seems to not rotate it at all.
Try holding Shift (or whatever you've binded your sneak key to) and Right-click whilst placing the block. Make sure you are not standing at a 90 degree angle
I've found that for some blocks they rotate if placed on the left side of an adjacent block.
The block rotation feature is still a work in progress, much like the update. I'm sure the bug will be worked on in the next few test builds. :)
Most Tardis blocks will be able to have block rotations, with exceptions.