Hi Ryan,
Those microswitches come in three flavors, NO (Normally Open), NC (Normally Closed), and ones with three contacts that support both. I'm seriously wondering if you've gotten one that's backwards from what you wanted; i.e., NO when you needed NC or vice versa. Whenever I'm replacing door switches, I just buy the one that supports both operations; that way I can use it in any position whether it needs to be NO, NC or both. Here's a picture of a switch that I'm talking about.
[image|2790025]
The red arrow is pointing to the common connector; that one is used on all switches.[br]
Orange shows the NO contact and yellow is the NC contact. Check your replacement switch against the original and verify that the contact you have is in the same position on both switches. If not, there's your problem; you've got the wrong polarity switch.