I have the same problem. I use internet explorer and the only way I can type in the boxes is if I go to my blog and edit it from there.
When I log in through blog.com/wp-admin.php and try to make a new post I can’t type at thing.
The only fix I’ve found to this is once signed in go to your blog and on any of your old posts click edit. For some unknown reason I’m able to then type to my hearts content and make as many new posts as I want.
Very strange, but it works for me.
