Sounds like you have a possible problem with DirectX - the WE uses DX to render all the graphics in the editor, so if your cursor isn't showing, perhaps you need to either update your graphics driver or make sure you have at least DX 8.1. What sort of mouse are you using? Does it use generic drivers, or did drivers come with it?
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.