I realise this may be reviving a very old thread (hence necromancy!), but having trouble getting the Spt Pack to work in MP on my mission.
In short, have set up Spt Pack as per instructions, done a few changes here and there but left the Logics, triggers and markers where they should be. It works a treat if serving and playing on local machine, until client joins then no longer available.
I think it's something to do with client not sending info to server to trigger sp, but I can't see what's preventing it.
IMission attached. Be aware: lots of addons required. After all, the whole point of this mission is a playground for new addons!