Got this massage in the apps editor:
"It seems that you are using your page with a different zoom than 'Actual
Size'. You should change that, positioning elements on the page is not
going to be reliable and some interface elements might not work if you
use a different zoom level."
And dont find a setting in apps menue to change this called zoom level, dont find a FAQ record for this or a forum thread with "zoom level". My firefox browser is also in normal 100 percent mode. So... dont get whats wrong and how to change it?