I was looking at my worker shift information and noticed that in a few shifts the, Inv Diff had a 0. Should I be concerned? 
How'd you get it to 0? i'm at .118% invalid and .170% block with 180th/s. I'd love me some 0 invalids!
He's talking about each individual shift. Sometimes your Inv Diff is 0 (very good).
TIME FOR 1-2 MORE BLOCKS BEFORE END OF MONTH/QUARTER!
MINE ON WITH KANO-SAN!