When I play on the PS3 I've had it where I'm not seeing enemy mobs and the battle music will pop up, I know I'm being attacked because I can see my health going down, yet I can't see what is attacking me. This happens when I'm just running around doing quests, which can be a tad annoying. I've found that by running away until I lose aggro and then logging in and out will fix the issue. I've yet to experience this issue when I play on my PC though. I agree something needs to be done for PS3 users!