[RELEASE] Aldéz's Portal Prefabs
I should have explained this in the documentation. The problem is most likely that you miss a filter_combineball_type entity. If you don't have it, everything that touches the catcher will trigger it. That means that the prefab will trigger itself. In the properties you need to change the Ball Type keyvalue to Launched by point_combineball_launcher. The catcher_wall prefab, as all other catcher prefabs, needs the filter_combineball_type entity to be named catcher_filter, by default. You only need one filter_combineball_type per map.
thanks, that helped alot. I was getting very confused. I was also going to ask about this 
I have uploaded a new version of the prefab pack. Should have done this a long time ago, but I forgot. It has been a while since I mapped for Portal and making this update, but I think I have all the new files and updates within the zip.
In this version, I have only one new prefab. The big changes are the bug fixes and the updated description in the documentation. Remove older versions before installing this one.
Happy Mapping! 
Thanks! that elevator prefab saved my life!
anyways... when i put a... switch in my map and then try to edit the outputs, in the "output" field the text in there is red and it won't let me change it. Any solutions? lol i'm a n00b at hammer.
status: Mapping (map 1 of 10)
I'm glad my prefabs also save lives. 
Anyway, I don't understand the problem you have with the switch. Can you be more specific? And what is it you're trying to do?
oh, wait doesn't matter. i figured it out now.
status: Mapping (map 1 of 10)
Ok, not to be raining on anybodies parade here, but... well, by using prefabs that you don't make yourself, you don't learn anything. In fact, you know NOTHING about how they work or function, as you would if you made them yourself. Just saying, from an experienced mappers point of view, that by starting down this road early you are doing nothing but setting yourselves up for trouble later on.
Once again, not to discourage anybody from trying to map, but rather to encourage them to build these things themselves. I struggled through making my prefabs (ie the elevator) but at least I learned from making it!
[/rant]Dvlstx
I've been saying that for a year but nobody cares. Oh well.
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I disagree that you don't learn anything for using prefabs. I've found Aldez's prefabs to be very helpful, especially when first starting out, but I've learned an enormous amount and am still learning.
In fact, I think that prefabs may actually help you learn more. For example, I figured out what texture to use for my lifts by looking at the textures used in the prefabs. The biggest effect though, is probably to encourage people to start mapping in the first place, instead of quitting in frustration.