When I switch on, the screen jumps to a size about 120% and becomes unusable. All finger work won't bring the normal screen size back but it is seen for a fraction of a second when you close the app (any app) Re-booting the ipad didn't help.
(1) What is the cause of this so I don't let it happen again.
(2) How do I get back to normal?
iPad 2, iOS 7.0.3
You might have Zoom, one of the accessibility functions, 'on'. Try double-tapping the screen with 3 fingers and see if that zooms it back out - and if it does set Settings > General > Accessibility > Zoom 'off'. If it doesn't zoom you back out then try triple-clicking the home button and see if that turns it off, and if it does you can then change what a triple-click does via Settings > General > Accessibility > Triple-Click Home.
Thanks for that. I had discovered that if I switched Zoom off the problem disappeared. So I switched it back on again and all was well so what caused the problem I still don't know but it went on for about 30 minutes. Home click speed was and still is on Default.
screen size jumps to about 120%
