UV/Image Editor, pink circle cursor sorry for asking this because I suppose it's a very obvious question but here it goes: I don't know which key I've pressed but when I enter in UV/Imager Editor mode the pointer looks like some kind of pink circle and I'm not able to work as usually. Can someone tell me how can I back to the normal UV/Image Edit mode? 

Thanks
You must have hit the Q key. I think its someing like "sculpting for UV editing" 
With your mouse hovering over the UV/image editor window tapping the Q key again will toggle it back to the regular selection mode.