I have the same problem with my m9 binding. I can't show you in a picture what the problem is. The last pic of the m9 the dude is pointing out the location. The screw that holds the hiback and the power strap doesn't stay in place no matter how tight it is. The teeth that hold are looked good so I must be the piece that connects the hiback and the power strap the failure.
I'm going to take a pic of the piece that I think it has the problem.
I think so, the part the back of the boot touches.
If it's the right issue this is something they're fixing for 2014. The urethane top panels can pop off the squared bolts that slide into the channels on the back of the panel if your standing on the highback and grab the panel to pull it up. With everything adjusted right you shouldnt have to be pulling too hard and "shoe horning" your boot in like with NXT's.
When getting in make sure the highback is all the way down so the straps are all the way up, that your toe strap isnt too tight, and try not to pull up on the top of the urethane panel.
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Going for my third set of flows, I've always had Size L NXT-ATs with my Salomon Malamute Size 9 boots. In getting this next binding to try out the active strap with the NX2s, I'm want to go as stiff as possible so the RS. Having a hard time at this point in the season finding anything but XL for sale.
Am I going to be able to setup an XL for my Size 9 boot?