I've been struggling with these risers for a while.
I currently have a five zone map with risers in zone 2 and in zone 5. The risers in zone 2 work, as shown here:
http://imgur.com/IayGloALater in the map, in zone 5, I placed risers in the same manner with the same KVPs, altering the zone name and the zombies do not rise, but rather spawn at the spawn entity locations and do not move. The zone 5 spawn era do not go to a barricade, so they have the find_flesh script_noteworthy KVP.
http://imgur.com/5ZGojEkI have triple checked my volume and zone assignments. In zone two there are 2 script struts close together near the spawned and in zone 5 there are 5 scattered around. I also have a regular spawned going to a barricade in zone 5 which activates and operates perfectly.
I download the zone debugger from here and ran it while testing map. I noticed that when I enter zone 2 it says "zone 2 spawners activated". It says the same for zone 4. It does not say so when entering zone 5.
Upon the start of the map, it shows info on all of the zones and the information is all correct for zone five, listing the one volume that contains it and the three spawned linked to it.
I've scoured the forums for a fix and I'm finding none, I'd appreciate some help and can provide any info you need, cheers!