So on my zombies map everything was working fine until I added my second floor. The zombies go up the stairs and step onto the 2nd floor platform I have made, but they eventually just stop for some reason, even though its a perfectly straight platform and it looks like the zombies should definately be able to get across it. Its not like they have to make a massive jump or anything, its just even ground.

So what the zombies do is just stop and do the 'confused' animatiion, where they do not move. I'm hoping this is something simple I'm just being stupid and missing.

Any help is appreciated. Cheers

So I uploaded a early version to my workshop before, however I basically made it into a completely new map now, so I would like to re-upload it. However I was doing it in the same map on radiant, so if I click to publish it just asks if I want to update the workshop file. Is there a way to make a completely new one?