It turns out that, for me, the issue was with the rafts section. I had disabled "Maintain only" but left Bipsi's Berg checked. Since this is not a mage, it hung up the cast because it could not create the berg... I guess. The issue is that if you have the berg enabled - and you are not a mage - it mucks things up.
btw... it still casts the oversized bobber regardless of whether I have it enabled, or not.
Hope this helps.