VS fails to process ANY traffic

In lieu of having access to the upstream router at the time of your reply (needed to get hold of that team this week), would it be possible to swap your suggestion (i.e. - change the F5 self-IP?)

I attempted this, and the desired traffic is definitely still landing on the F5 (and the initial landing interface - 1.1 - is now even showing some packets going OUT of it (rather than multicast packets only), but still not seeing any statistics on the VS OR the interface that is ultimately to deliver the traffic to the server (1.5).