VeraAlerts in a bridged system

I seem to be having an issue, and I am sure it is something I am doing wrong.

If you are running a bridged system, Pri/sec setup, should VeraAlerts be on BOTH devices or just one.

I have my main house, and located 300FT away is my building. I want to trigger events and get alerts from either location, and it seems if I add VeraAlerts to the slave it works for about a week, then all hell breaks loose. Is there a way to implement this across a bridged network? I know this is an area of confusion, but it is so close to being really good for what I need I hate to give up on it.

Thanks