Can you post a screencap of what you are seeing?
I get a snafu once in a great while where the font size changes for the whole page (including the search or headlines views).
And it’ll become really small. Edit screen, all of them retain the view size, so it doesn’t seem to be a lingering “font size=” command.
My only solution is to close the browser (IE) and browse from a new window.
I found the problem though I don't know how it happened on two machines simultaneously.
The "Articles" tab at the header got switched to "Activity"....on my desktop FR page and my laptop FR page. Simultaneously. While I was not even touching the mouse. Mouses? Meeses? Mice? Human Interface Input Device. Devices? Devii?
Could it be that you just become really large?