Of course nobody is on-site! IT work isn't suppose to be easy and go your way right? hehe
Quite honestly I'm not sure about the hidden setting, but it was just a thought. This one is kind of bothering me, as I am sure it is bothering you. I keep going back to the notion of traffic direction. You know how you set the address of 0.0.0.0 or 0.0.0.0 0.0.0.0 and that will default to a route specified. But we are dealing with Layer 2 here. Alright I'm starting to ramble my thoughts on this thread. Sorry I can't be much more of help, if any at all. Let us know when you find the solution though, as I am quite curious.