So this bug was present in the 0.9.0 Beta Builds 7, 8, and 9. After re-installing Build 6, this bug does not exist.

The Bug

The bug is that signs cannot be placed on top of fence posts or cobblestone walls. The sign will place itself on either side of it. Then, when you want to destroy said sign, you can't; the game simply won't let me. I have to destroy the fence and put it back.

How To Replicate Sign Placement Bug

1. Use 0.9.0 Builds 7, 8, or 9.
2. Place Fence or Cobblestone Wall.
3. Attempt to place sign on the TOP of the fence/wall.

How to Replicate Destroying Signs Bug

1. Follow the instructions above.
2. Attempt to delete the sign.
3. The wall/fence needs to be removed for the sign to also be removed.

In conlusion this is really two bugs in one report. I put them together because they both had to do with Signs.

The bug is non-existent in Builds 4 & 6 (I didn't test 1, 2, 3, or 5)
Apologizes, no screenshots!