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 here, matter of fact all tabs have disappeared in the Provisioning section (including "Development" and "How to". Last time I was able to access the Distribution tab was last friday. I have not been able to find an explanation on the developer portal. I guess at this point we'll have to wait. I'll be sure to post an answer as soon as the problem gets solved on my end.