Ok, I must be going insane. I had an AE processing pattern set up and working using an interface attached to a gregtech machine, but then suddenly it has stopped working.
My setup is an interface attached to the side of a bending machine. This face is set in the machine UI to be the export face as well. I tested this a few times with a steel ingot -> steel plate processing pattern and it was working, ingot went in, plate came out into the AE system. Now the crafting hangs with 1 steel ingot "stored" and 1 steel plate "scheduled" when looking at the crafting cpu. It does not attempt to put the ingot in the bending machine. If I put the interface on the bottom of the machine then it does input the ingot, but of course can't output anywhere. If I put the interface on the bottom and output to the bottom then again it doesn't stick the ingot in, same as on the side. I have tried this with all 4 combinations of auto-input/output enabled/disabled via hitting it with the metal hammer, and it doesn't work with them either.
I have broken my network down to the simplest possible isolated case so now it is just a crafting terminal, the interface with the processing pattern, a drive with an 1k cell (containing 1 steel ingot), a 4k crafting unit and power.
(The bending machine is set to output to the bottom in this case
http://imgur.com/bohjr4B)
I can't understand how I can go from a system working with the exact same setup for multiple machines to now the simplest possible case failing for just one. Anyone have any thoughts?