I haven't tried to post a blog for a while now, but there was another thread on the forum where someone else was having trouble. The suggestion there was to try a different browser. Google Chrome is supposed to work the best, although I tend to avoid that browser unless I really have to use it because I don't like Google's privacy policies. So, you might try different browsers to see if you get different results. But, based on the low number of blog posts appearing lately, I'm guessing there are more out there who are having problems and are just waiting for things to clear up. (But some are getting through, so it is working somehow.)
Nancy