Hi everyone! I need help for a strange bug: i'm playing a sith assassin (13th lvl) and i'm on Dromund Kaas. I have been attacked by some "invisible foes" several times, while I was playing. The companion recognizes and attacks them, but I can't even select them to attack. Even when Khem Vaal defeats them I can't select the dropped items, even if I receive the XP reward. I think they're Vine Cats because I need to collect parts of the body of these beasts for a quest and now, when I'm under attack of the invisible foes their dropped items make that yellow light you see when drop a quest item.

It's quite funny as issue but have no idea how to solve it! Any advice from some of you guys?

Thanks a lot.