Right now SafeFrame swallows most unhandled exceptions. It should log these and allow configuration to pipe this log to console.
Just wanted to voice support for this. Being able to view logs would be very helpful.
This feature was added prior to 1.1. In all current builds.
Publisher can listen for errors by subscribing to the "onPosMsg" callback in the sf.host.Config call. Listen for the "error" message.
This info is also available to the publisher in: $sf.info.errs array.