Can't melee, and hp bars dont update

[Dekai]

Since I logged on this afternoon I've been experiencing a weird issue. I cant melee anything, and yes I have a spear equipped and auto attack on etc. And mob hp bars aren't updating until I de-target them and then re-target them. Using this method I managed to somehow swing twice but since then I haven't been able to. I have patched the game up to its most current update and have relogged, restarted, and even restarted my router. Is anyone else experiencing this or have any ideas for me?