I am playing with Applied Energistics and storage busing an armory cabinet. I keep having a bug where items will disappear and reappear. If I hold shift in the terminal I can see them going from one to zero and back again. There has been no loss of items that I can see though. I am playing on the 1.07 version of FS with the latest current version of AE. It appears that the items that are vanishing are related items. IE I can make it happen by inserting multiple enchanted pickaxes into the cabinet.

Edit: I have added a video to youtube showing the bug. https://www.youtube.com/watch?v=bX8jFfOA8Vw