This first image is a showing of my setup, just to show that I how it looks in factory, and then I made a reduction for purposes of clarity.
To give a key to my system:
A is the shredder in which is having the problem, B is the roaster and its item storages, and C is where my storehouse is.
I am able to recreate this problem, and I’ve done your standard trouble shooting which is all of the GT6 equivalents of “turning it off and turning it back on again”.
All item storages have the same exact setup, reset filter when empty, and release inventory to below item pipes. When there is a small amount of 1/72nd dusts that does not combine to a bigger dust in A’s storage, then it gets stuck in that storage. Oddly enough, B’s item storages do not have this problem, it will go to C’s destination no problem. I can’t figure out why A’s item storage behaves differently than B’s. I’ve made sure B is not running so that it doesn’t have to content with A, and I’ve already made sure the pipe’s are empty before putting in item’s in A’s item storage.