Not to beat a dead horse, but I'm not using any mods and I'm having this exact same problem on my Arcane Knight.
No longer does AOE when I use flames of devotion (but auto attack does AOE damage just fine), and if I don't cancel action after flames of devotion is used, my character will continue to use it with no recovery time until all paladin resources are spent. I know you guys are working hard but please fix this. It is super annoying. Thanks in advance.