I can't attack, etc. anymore...wtf?

[gummab]

I had this happen a few months ago,i was using default ui at the time.
Ended up just doing a fresh install to sort it out,think its some kinda of corrupted file.But dont take my word as gospel i'm no computer wiz,there may well be an easier solution.

[rusty81]

I know this sound stupid however I had this problem when running Google Chrome in the background it also affected my mouse scrolling and movement... When I closed Chrome and used IE the problem went away.