I called Customer Care today about this issue; the woman I spoke with told me it was the first call she's recieved about this, and eventually i had to be escalated to her supervisor's supervisor.. I was told that it's an issue that they are working on correcting, but in the meantime the way that you can see your reservation info (and you dont need to log out) is:

-- Click on 'My Reservations' (My Trips)

-- Click on the Confirmation # hyperlink (in blue)

-- Scroll down slightly to the box that says 'Cancel Changes' (showing up as a gray box for me), and click on it


-- On the next screen, you should see the question 'Are you sure you want to cancel all changes to your reservation?'... Click Yes

-- The next screen should show you all of your reservation info as we were used to seeing prior to the website "improvements"


In addition, if using the Marriott app-- it seems to be unchanged in re to seeing your reservation info as before.

Hope this helps(!)