Depends on what your computer is using as to which place you change your screen resolution - on mine, the easiest way without keyboard tricks is the bottom right corner - it shows a + sing and next to it is 100% - you can click and change that to different percentages which will change the font size, also.
But we have determined that it's your computer.
On my laptop now, if I don't use a mouse and lock the the pad on the laptop, it changes all kinds of things - like my size text and lose posts, etc - just because my hand rests wrong (or right to it
)
Good luck.
Beth
“Dare to live the life you have dreamed for yourself. Go forward and make your dreams come true.” ~ Ralph Waldo Emerson ~
"He who treasures the small things in life has found the path to true happiness"