From googling his seems to have happened a few times to other people as well in cloudrest, early june.
I played cloudrest +2 and +3 yesterday evening and died a bunch of times. On at least three of these occasions, after being ressurected i could not use skills, light attacks, barswap or use synergies. I took damage, could be heled and did get the blue curse that you need to barswap from, to prevent team damage (which i could not). reloadui did not work, only restarting game. Seemed to only happen in CR.
My lag was bad at the time, seemed to be an internet service provider issue.