Can't switch Payments to live mode

Hi, I just set up the classifieds on a multisite, buddypress install. First I want to make sure that I was supposed to only activate it, not network activate.

Also, I am trying to set up the credit fees, and it will not let me save my Paypal Express info as Live. When I hit save, it keeps switching it back to Sandbox. It is not a sandbox API, and I have used it elsewhere on my site too.