Right, I'm sure there are a lot of questions about this, but I can't seem to find a solid answer for my problem.

I'm having problems with zoning. I have two zones, start_zone and zone1, and the start_zone zombies work fine, they can walk around in both zones perfectly. But, the riser that I have behind a window without barriers will not spawn.
I have a hole in the wall, with pathnodes leading up to the wall hop prefab, and a zombie behind the pathnodes and the struct for the riser next to it. It will not spawn, the only zombies that spawn are the start_zone zombies. Has anyone got any solutions for my problem? Thanks 

Make sure zones are not touching and that you added "zone1" to the script. Also check if your trigger has the script_flag for the zone to activate

Thank you, and now the zone1 is working. But now, I created a third zone with a zombie riser coming through a window without any barricades and it won't spawn. Instead, when I'm in zone2 at the start of a round, the rounds just skip until I exit the zone. Again, I can't find a solid answer. Any suggestions? Thanks