Question: Today under developer.apple.com member center > iOS Provisioning Portal > Provisioning menu
when clicked only brings up the "Development Provisioning Profiles" 
it has to "Distribution Provisioning Profiles" !
Any idea why this is so? Any change in the way we need to create "Distribution Provisioning Profiles"

Answer: 
I had the Same problem. The Solution was that I was Admin for iOS Development, BUT only a member in Safari Development . Tell your agent to make you Admin for safari too and you will be able see the Distribution Tab.
Same issue for me. Yesterday all works fine but today the Distribution Profile Tab disappears. I hope it just a bug on the site!