I wore the (mens!) Cumulus 9 with no prolems. The 10 gave me really bad blisters on the balls of both feet....had to wear plasters every time I wore them! Consequently I've worn the 9s for 2-3 times as long as I should have.
Tried the latest version and felt the same thing was going to happen so am trying a different brand that's a bit narrower.
So yes, I think they've changed the design. Have a look on the RW reviews for the shoe and see if it mentions anything.