I have noticed that my accepted shares were at 1024 difficulty instead of 512 as it used to be. Maybe something wrong with the difficulty switching? restarting sgminer "fixed" it for me (also back to 512), but I still have a 8h window with 100% loss right now
Are you sure you didn't fail over to a different pool? I believe middlecoin set their difficulty to 1024.
100% certain, middlecoin is far in my list and the only other pool that had accepted shares is clevermining and it was very minimal (like 10 or so). I've sent an email to wafflepool with a log of my sgminer showing accepted shares at 8h30 this morning