I don't know if someone already reported this but here it goes.
I think it's a bug, each time I quick load (F9 - PC Version), I get the message: "You are carrying too much to be able to run", and so I'm unable to move around, it's kind of annoying, during combat I tend to quick load each time I die, it's faster than waiting for the game to do it, the only way I found around this is to access the Menu and go to Items, checking the weight, closing the Menu and then I'm able to move freely again, it started happening since the patch 1.2 and still keeps happening in patch 1.3.
Can you verify if it's just in my game or if it's really a bug thank you.

EDIT: I just tested something, since I have "Heavy Armor" skill 100 and have the perk "Conditioning" so that armor weights nothing, I dropped the armor, quick saved, quick loaded 3 times and no message, then I picked up my armor, equipped it, quick saved again, quick loaded and there is the message again, so I can assume it's something to do with the perk "Conditioning" from "Heavy Armor", not loading correctly, since my weight without the armor equipped is 411 of 400, and equipped is 359 of 400, with all the other stuff I'm carrying of course.

My spec's:
Windows 7 x64
6GB Ram
AMD Phenom X4 @ 3.0Ghz
nVidia GTX 460 1GB
Skyrim patch 1.3