I went into the system core (level 5 core at level 23) and saw 4 enemies spawn with the left most position being free. During the first round of turns, the left most position has an enemy "mimic" another enemy type (the green solar system looking one). Then for about 5-7 or so of my turns every thing is fine. That enemy is mimicing other enemy types and attacking, then it rolls a back to him and... nothing. Nothing happens. It just sits there on his turn doing nothing.

The last thing in the battle log was that a saboteur had been defeated, but he hadn't. It still had 150+ HP left.

I forgot to take a screen shot and couldn't find any bug report button.

Let me know if you need any further information.

This has happened to me as well. Mimic means bad news, other colors work just fine.
Once you hack into any console and the first color you see is green, don't waste your time and leave.
I've already let go this new content, maybe you'll find something intriguing, have fun.