I am convinced that this is caused by the same thing which is causing the latency/lag issues on AoE's and character posistion updates to the server. (its all intertwined)

I've noticed that sometimes my skills will go off without much hitch but other times I have to spam the buttons for them to activate and even then when the skill button animation goes off the effect doesn't take effect and the button is still lit up.

They need to sort these issues out before everyone leaves.