After getting stunned, I can't use any of my skills. Switching bars doesn't help. It happens very rarely (maybe once or twice a day) but when it does, I'm practically useless for 10-20 seconds or until I get stunned again. I've lost many PVP fights because of this bug. In some cases, the animations are cancelled immediately after firing a skill (e.g. Healing Springs). In other cases, nothing happens at all. Check out the following video where I present the problem:
https://www.youtube.com/watch?v=DSoHD8kPtOQ
Can you believe it? Dragons! In your own homeland! What are you going to do?