The sorter is moving 0 of several items when it runs. I loaded up my world with sorting off, turned on sorting debug, and ran two manual sorts. Here is my http://pastebin.com/crtczXhp. Lines 58-61 show the exact bug I'm finding, with the sorter queuing up movement of 0 items.

In particular, I'm trying to get the sorter to pull specific ores into my refineries. The ores that are not moving are currently Stone, Iron, Nickel, Cobalt, and Silver. I don't have any Magnesium, Silicon, or Gold to see if those are working. Uranium and Platinum are working just fine, however.

I double checked all ownership (including hidden objects) on all attached grids, and it all belongs to me. All of the blocks are on and the station has plenty of power. All of the refineries have "Use Conveyor System" turned off. All of the refineries are empty, except for the two which are working properly.