I have an interesting bug where my rotary macerators will not macerate any items placed in the second slot. The first slot works fine, and once the first slot has been macerated the items just sit in the second slot and the machine begins to spin down. Also, when piping items into the macerators via redpower pipes (into the top) items will only fill the first slot, I have to fill the second slot manually (and of course it doesn't work).
Is this a known bug? I checked back a few pages and didn't see anything about it.
Edit: I am running version 4.7a.