Trouble writing in the body area of new message.?

I have been using the "New Yahoo Mail". I just seems to work for me until today. Whenever I start a new message I'm able to fill in the To: CC:, Bcc:, and the subject line just fine. But when I try moving the cursor to the body of the message there is no response. I've clicked and tabed to the body area and I've even been able to select all and it highlights my salutation and the blank lines, but it won't show me the cursor and it won't let me write anything in the area. I double checked to see if choosing reply and forward and that works and it does. I'm also able to use the old Yahoo client and it works as well. It only occurs with the new message body in the New Yahoo Mail client. However, I did find that I could save it as a draft and open up for edit and that works well. I've cleared the cache and deleted the files, cookies and history, but still nothing. I'm quite puzzled by this.

Clear your browsers cashe.

In Internet Explorer, click the Tools button, and then click Internet Options.
On the General tab, under Browsing history, click Delete.
Click Delete files, and then click Yes.
Click Close, and then click OK.

OR

Yahoo Mail > Options > General Preferances > Composing E-mails > Mode: > Compose
messages as plain text > SAVE