Signs Missing on game restart - text is freefloating

Placed signs not showing up on game restart

What I expected to happen was...:
sign and text should be present where placed when game is restarted.

What actually happened was...:
On restart, sign board is missing but text is freefloating.

Steps to Reproduce:
1. Place sign in creative mode after filling in text.
2. save game and exit program
3. restart program and game
4. Text is freefloating but sign is missing. text visible from "front" of sign but not from "back" of sign.
5. Sign can be brought back by exiting to settings menu, not changing anything, and entering back into game. Sign will present with text. Changing graphics levels (high, normal, low) do not affect condition.

Hardware: Galaxy SIII under Android 4.1.1