Y’all,
Not sure if this is 11.6 specific, but you need to go to the Realtime Snapshot Config in UCCX and enter the info for your wallboard server there. (Tools –> Realtime Snapshot config). This is what eventually got it working for me.
Accidentally figured this out by looking up to see if there were any schema changes on the DB, and when i looked at the RtCSQsSummary referenced in the SQL query in the .asp, it referenced this.
Anyway, hope this helps someone in the future.