Demon Form not working

Prior to patch 0.1e it seemed demonform had been fixed. At launch it had an issue where you would immediately get kicked out of demon form. I now am having that issue again. I use lots of cast speed, blasphemy with flammability and if I go into demon form it will work, I can run around and it's all good, but soon as a cast a spell I'm instantly taken out of demon for. I tried with multiple spells, so im not sure why. My hp stays full, my mana stays full, but as soon as I try to cast any spell I'm taken out of demon form making it a useless use of ascendancy points. Which also makes the class kinda bad as that's the main perk.