Ok I know exactly what you are talking about now. I just encountered it the other day with a user on our network. I dont know if you have the testing capability at this point and time, but try sending a very basic message where you do nothing else, but type a few sentances. If you send a message to yourself and reply back to yourself can you simulate the error? That way you dont have to bug someone else..hehe..
Anywho create a new message that just says
This is a test.
Absolutley no formating what so ever (No returns, enters, or anything funny just the 3 space bars your need in between words).