I'm having the same problem with their new Microshell Folio (http://www.marware.com/microshell-folio-case-for-the-new-ipad).
I can click the new iPad into either the lower left corner OR the upper left corner, but not both at the same time.
Not only that, the lid's sleep/wake function doesn't work.
I like the potential of this case, so hopefully Marware will offer some options. I've contacted Support.
I finally got it to snap in! It's a super tight fit.
Still can't get the sleep/wake function to work, though.
I am guessing those that have had success are using the updated "new iPad" version rather than the iPad 2 version.