The one bug that I have encountered that I think might have been said is that if you get rooted while charging your q, ie ryze morgana maokai, it will charge and the bar will stay full, but you wont move and are stuck until it goes on cooldown. I think it only happens when you release q during the root.
Steps to repeat:
1. Pick Vi
2. Charge Q
3. Get enemy ryze to w you (the rune prison)
4. Release Q during root
5. Have charge suck as channeling but not be able to activated until it automatically times out and goes on cooldown
Also I used ryze because I specifically remember it being from rune prison. It might have also been from a morgana binding which is why I said all roots.