I'd think you need to add more commas then; you don't want the click attempting to call a spell which is still on cooldown. Ideally, you want Incinerate (the fall through) to be casting while your timed spells are on cooldown.

The only other thing I could think of, to cause it to hang (if you have enough commas) is your reset conditions. Conflagrate and Chaos Bolt are on hard reset cooldowns, so even if you switch targets the spells will not be available until the full time since last cast has occurred. It is ok for Immolate to be reset=target, but Conflagrate and Chaos bolt need to be reset=combat, otherwise a target switch would reset their sequences, with the spell possibly still on cooldown.