Wow, I feel even dumber... All those times when I had a PS set up, Nothing showed up when I ran the map. This was because I didn't wait the 20 seconds to let it start...
If you don't know what I'm talking about, HL (or NS, not sure) starts the particle systems 30 seconds after the map loads, to increase performance on the server when a bunch of people are popping into the map. So basically, I just have to stand there for 30 seconds, and then all my beautiful particles appear
Bubbles!
It's not nice to make mappers sit and wait 30 seconds...