*What I expected to happen was...
-Open Inventory -> Left or Right click a Block to pick it up/select it -> use Block to craft an item from my Inventory

*What actually happened was...
-Open Inventory -> attempt to pick up/select block by Left or Right clicking -> Nothing happens

Steps to Reproduce:
1. Open Inventory
2. Left click desired block (this fails)
3. Attempt Right clicking desired block (this also fails)
4. Check Control settings (to make sure I am not just being dumb)
5. Repeat Steps 1 - 3
6. Click with "Button 3" (nothing happens.. not even sure what 'pick block' means)
7. Restart Laptop and check Internet Connection
8. Repeat Steps 1 - 3 and 6
9. Give up and file a Bug Report

Other Information:
Placing the cursor over the space I wish to move my block and then hitting it's corresponding Number does successfully move the block. But, I am still unable to craft anything (such as a Crafting Table) because I can not select a single block. This method only moves the whole stack.