I just recently switched to SL pedals and yes they are a bit more constricting then my old SPD-R pedals which had plenty of float. I set up my shoes so my feet are in the exact same position though.
Now a week and a half later i'm starting to get some mild pain right above and around my knee cap, not sure it it's muscular or joint related. It generaly only happens days when i push it pretty hard, sprint quite a bit, or do hills, so mostly out of saddle stuff.
I know behind the knee pain is the saddle height, and side knee pain is cleat alignment, but what bout above the knee pain? Any takers?
I'm thinking it could just be where i'm used to trainning on rollers for the past 2 months, my legs aren't used to being out of the saddle and it'll just take some getting used to and take it easy for the next week or two.
If it gets worse though i may pay a visit to my favorite physio&message place.
Just a side note, my knee's have always cracked (think cracking your knuckles) when i bend my knees sitting on my legs or squatting down for excersize or picking something up. The cracking often feels quite releiving.