Hi Spartan,
Here are a couple of things for you to check, If the foam is not making it to the collection cup:
Make sure that the venturi tube screw is open enough to allow air into the skimmer and that your pump is powerful enough. Is the skimmer in your sump? Or is it above your aquarium. Explain your setup. Also make sure that your skimmer's internal plastic tubes are properly inserted, If they are not, your skimmer will not produce any foam in the collection cup.
HTH,
Scott