Felix's Hammer Notepad
I see. I didn't know changing the rendermode would affect portals. 
It's really cool. It doesn't change the way the portal looks, it just doesn't transmit light, so you can have as many onscreen as you want. Same for worldportals.
Not a very good video today, but I got splitscreen with a static camera working with Adhesion Gel.
Does this only work with a static camera, the second player can just watch what the first player does, or did you finaly get Co-op working?
Also how far is the Map-Pack you are working on?
I really should continue the Map I'd startet, I've taken a break from Mapping for a few weeks now...
It's not true co-op, the gel only works for blue. But red doesn't have to be static, it's just a better effect (the cameras are in the monitors).
There is a problem I have and that is that I don't know where to put the player marker. Now the player spawns outside the map when I walk on the gel. Also, it seems like that sometimes trigger_vphysics_motion being dissabled doesn't affect the bomb when a cube is fizzled off a button connected to it, but with a player walking off, it worked. Here's a screenshot of what I have so far: http://steamcommunity.com/sharedfiles/filedetails/?id=190741193
The map looks nice! The playermarker can go anywhere, the script parents it properly when the map starts up. I don't know about the vphysics_motion thing, but with the gel it sounds like the player's position is not updated properly. Could you post the last few lines from the console?
Sorry for the late reply. Just forgot about this.
ERROR: Tried to SetParentAttachment for entity info_target (playermarker), but it has no parent.
Also, where do you place the world origin or whatever that target is called? Also anywhere in the map?
Okay, I'll look into that. It sounds like something went wrong with the startup script.
The @world_rotator needs to be somewhere near the center of the puzzle. It doesn't really matter where, but the world will rotate around it and thus the containing box needs to be centered on the rotator.
New update on the Adhesion Gel! This isn't a cheap attempt to one-up Sicklebrick, that would be petty...okay, maybe it kind of is.