hah yes i think i may have done something. this is a new netbook or whatever they call them and am still tring to work stuff out. i have looked at my font settings which were on small so made them medium and now i see what you are saying about the zoom on the toolbar so god knows what i have done now.
last night it was a momentary small then back to size then big and back to size. but i think you are right, this is something i have done myself!!