Not sure what all that means above - I go from the main W8 screen to the desktop (ie the one with the keyboard options and time and date at the bottom right, and on that desktop have several shortcuts to webpages. When I tap these they opened but the window minimised so I cant see anythng in the window - I then had to maximise it every time which is annoying. Previously the windows opened to full screen but they they don't any more - but I can't discover why!
On the wheel, the zoom is set to 100%
I tried the "reset" as suggested and now the windows open full height but not width, so almost solved - its as though they are on an old 4:3 screen - so thanks for the help so far- much appreciated.