I had the same problem. Except I don’t know if you could type in the Text Box to post a blog or not, I was only able to type in the subject line. I couldn’t type in the text box at all.
I found the installation was corrupt, so I uninstalled the program and reinstalled it. Now all the problems you mentioned above were gone for me and I can type in the text box now. Maybe try uninstalling and reinstalling the program.
