upgrade buttons not appearing on subscriptions or account pages

I've got the latest Membership plugin installed and all the basic functions are working fine. Only thing is, when I access both the subscriptions page and the account page, the "upgrade" buttons do not display.

-I have 2 subscription levels: Member (Free) and Patron (Premium)
- I have the proper gateways activated: Free and Paypal Express w/ Single Payments
- I have stranger level set to "Member"
- User registration is set to "Member" & incomplete signups enabled

Any ideas?

thanks,

todd