I was buying a new pair and tried the NB 940 as have used NB's before without problems.
Doing my test circuits around the shop perimeter I was surprised at the perceived amount of rearfoot slipping / lifting (not sure of correct term) as I have never had / felt this problem before. The laces were laced by the shop attendant (as I obviously look my age) to the first eyelet on the collar, as I usually do.
I then tried, and purchased a Brooks Bear? which didn't seem to have the problem, as much.
Question
Have the more recent running shoes less depth in the rearfoot (the top line / feather line seemed much lower relative to my malleoli), and / or greater stiffness in the midsole (beneath the forefoot and midfoot) and / or a shorter quarter / collar / throat which are the reasons I imagine responsible for rearfoot slipping / lifting out of the shoe?
Thank you, mark