Ever since the layout for the My Account page changed I've lost access to numerous features including my plan and CIS. Is there any way to go back to the old layout or a direct link to old pages?
Doubt you can go backwards. The CIS should be there (if not you'll need to ask LIVE chat to ensure you current plan is linked in properly). Currently they are under the YOUR PROFILE link at the top and then CONTRACTS (although my contracts aren't displayed at the moment even though they were there last week.)
You can find all historic CIS documents if you google for them.