spawn group id?

[Zengez]

I'm busy populating a new zone full of custom mobs and whatnot, I can spawn them fine, and for the most part get them to stick, but occasionally a certain npctype spawn just won't make any spawns... I tried things out and it doesn't look like it is generating a spawngroupid when i do a #npcspawn add, even thought it says they are added successfully... anyone know why that might be? and/or how to fix this?

I 'could' do it by just generating them straight into the database, but it's a pain to insert all those x/y/z statements when i'm populating 300 mobs so i'd rather avoid that option if at all possible.

Thanks.