Update: after counting materials, for whatever reason, some materials were landing in my bag, others into my bank, giving the appearance that they were disappearing!

I had read about RE being broken concerning returning patterns. But today I RE'd two implants. My chat box said I received two different materials back, but I only received one into my inventory (I have very little in my inventory at the moment, its not just getting lost). Is this also a known issue?

I think people are forgetting even WoW doesnt "support" add ons. They're at your own risk, unsupported things. I feel by saying they won't be "authorized" is not the same thing as saying they will never exist.