Thank you TG20 for spending the time!  I just found out that I am also affected.  I am also like you who need to type different messages before the invoices were sent out.  It has been working fine until sometime in May (checked my sent box record).  It is embarrassing that I had to find out from my customers that my emails were funny.  Also, thank you for the workaround.  You save me a lot of time.  Otherwise, I wouldn't have not known what to do.  Thanks a lot!