I looked to see if anybody else had this problem, but I couldn't find it. If it's there and I missed it and I'm wasting space, I apologise.
On M4-78-B, I got all three Protos spy processors. I go back to give them to HK-47, only he's not there anymore! I've looked in a few other places on the moon, and I've tried reloading the module both by exiting and re-entering and by reloading a save, but I can't seem to find him. I can look more thoroughly, but since neither the spoiler walkthrough nor anybody else mentions him being anywhere else when you report to him again, I'm guessing something's wrong.
Thanks to anyone who can help!