Fanboy checking in... absolutely love these cans - I don't use any of my iems anymore, and my previous portable cans - sony NCs and M50s (I know, sound signature is completely different) get no love now.
I have the same problem with the glasses. It can be a bit uncomfortable, but just pop the rails on top of the ear pads and it's fine.
I had to glue a portion back on, too, to prevent it propogating further.
I think the problem is the case - the pads are too big for the small slot the head band fits in, and it pushes it off.
I'm still a fan, though I was pretty annoyed to have to glue one of the headband pads on last week in order to get it to stay in place. They don't get quite as much use as they used to, but they're still my go-to cans for portable and work usage. In fact, I just listened to Elliot Smith's XO on them the other night, and I think that it was the best it's ever heard it--better even than my HD650s.
As a bonus, the cans are pretty well broken in at this point, physically speaking (Or maybe my head is). They're still uncomfortable, sure, but I can stand them on my head for a considerably longer amount of time than I used to be able to, and achieving a seal seems to only get easier.