Changing Send to account causes deletes body message

This issue is driving me crazy, so I thought I would post it here and
see if anyone else has experienced this or has a solution.

I have installed Outlook 2007 with two sending and receiving accounts
and two signatures. I have one account as default (Home) and one other
account I use (Work). So if I click NEW Message, the New Message
appears and I type the body of my email. Well if I just hit SEND, it
sends with my Default Home account. No problem.

But the problem comes when I CHANGE the Send to account because
everything I've typed in my email disappears except the signature. I
can sometimes hit ctrl-z multiple times and get my message back, but
sometimes the message is lost. And if I change my defualt account,
this still happens.

Outlook 2003 did not do this.

What is causing this crazy behavior? I would love to fix this problem.

Thanks,
Sharon