Browser page size variable( 3/4 to full )on opening
 

They always used to come up full size now they come up only 3/4 size regularly untill i maximise them and then all ok, i assume it's a setting somewhere but i can't find it.... anyone know?

Open one page that is sized... double click to make full page then close the brower.
It remembers it's last position so that should sort it out.