I have a forge (I've tried ALL of them) sitting in a room in my level. I have made sure it is completely contained within one particular roomspace, and I have made sure it is always loaded. But no matter what I do, the stupid forge is always invisible! It's there, and I can use it... but the whole portal/roomspace business just never think it needs to be visibly loaded... is this a bug, or am I just going to have to remove all my portals and roomspaces?

Is it completely covered by a room marker? It's pivot point should at least be covered (sometimes even more). Make sure the marker reaches below the floor it's supposed to contain as well. Or maybe the forge is covered by a different room marker (if it's near a wall)? If the object is in a difficult place and is covered by multiple room markers, you could consider using a multibound.

Also, check for room/portal errors. Badly placed markers and portals lead to weird bugs in rendering. You might experience these bugs even if you get no errors but have made other mistakes, such as overlapping room markers that should be separated by a portal (overlapping joined markers should be ok).

I guess multibounding it to the room worked. Can you explain a bit about multibounds to me? The tutorial only mentions them once, as a hotfix for one problem.

As far as I know, they bind objects together, so that when one object inside the multibound marker is rendered, everything inside the same box renders. I've been using them for large objects that easily go outside of room markers into "wrong rooms". I think they're mostly meant for external cells though.

Okay, thanks!