I don't know if this is the invisibility bug, but a guy started talking to me, when there was nobody, he even launched 3 missiles on me, but I couldn't target him, due to his invisibility. Is this common? Well this is not a report, he didn't do any damage at all, I am just curious.
Edit:
Before he fired the missiles, my shield disappeared, and I saw a strange green light. After the third missile the game crashed.