TimeLine

I have a clean install, no evident problems yet in 7.1 but something changed somewhere relevant to the timeline and I do not know how that happened as I did not change any ccs code ...when I post to the timeline it is now a larger and bold font. Is there any way to get this back to normal?

The problem is the text has the class .bx-def-font-h2 applied to it; that is causing the text to be 18px in size and bold.  That may be applied to it using a style in the editor or it has gotten applied in the template.  Hard to say how to fix it without knowing more.  If you can edit the text, see if a style has been applied; it may be that it is applying it each time you create a post to the timeline.