Jatplane

Well I followed through the tutorial and manage to get my private server up and running but the server is my personal enjoyment only. However I have one problem.... My Mobs aren't running around!!!! Or I should say I can't to see my mobs moving around. The seems to teleport from one spot to another. Is it the Aethena problem or my Hexed Client? I do suspect my Hex Client to have something to do with this.... Anyone know how to solve this?