I have no idea if this is even related, but its strange given that I see these threads pop up now and I saw a similar issue when I woke up this morning
Im currently mining at coinshift and about 6 hours ago all of my hashrate disappeared from the pool stat page but my 2 rigs were still hashing away like normal. This happened until I woke up and restarted cgminer - everything seems normal now.
The really weird thing, and again, Im not suggesting anything but just telling what Ive observed, my hashrate at ghash went UP. I mined with these guys during their 2x week and havent touched them since. This is weird because on both of my machines ghash (LTC) is at the bottom of my failover pool list and I imagine it would be highly unlikely that there was 0 response from any of my 5-6 pools that were higher up in the list. Maybe its just a weird coincidence but its strange that id be hashing at ghash, on 2 rigs, without having touched the pool in a number of days
If it helps anyone, I'm running windows 7 with sgminer, and my other rig is running SMOS (bee edition) with cgminer-kalroth. I have no other monitoring software besides what smos offers, and the smos machine has nothing else installed on it. Since the day it was put together I haven't installed anything new on to it.
The only thing I have running on my smartphone is the Mining Pool Status app, but I only just got that and haven't added any pools to it yet.