Something has seriously changed in the last two days. I usually add the tag < big > (without spaces) to increase font size, but now, when I migrate between text editor and visual editor it disappears. My one blog theme has a very small default type size, so I need to do this on a regular basis, but two other blogs are also being affected. It only works when I post directly from text editor; and if I have to return to make a change, I lose that tag again. The HTML for italics and bold face seems to be unaffected.
The blog I need help with is paulwilkinson.wordpress.com.