Hi Debbie,
I do not see what you see but do me a favor, the next time it happens, there is a button on your keyboard called "Print Screen" It is at the top part of the keyboard and just off to the left of the numeric key pad. When this happens to you again, hit the Print Screen button then go into a program like Irfanview or Microsoft word or any other program that can display graphics and either left click and paste or go to edit paste. It will display a screen shot of what you see. Save it as a file and send it to me via email.
I would also like to know what browser you are using? Internet Explorer, Mozilla Firefox or other?
I believe it is a conflict with the browser some people are using because I have only heard from three people who are experiencing this.
Also something that might be the cause is the spell checker, try unticking the spell check before you add a smiley. I am attaching a pic of what it looks like, just untick the check box and see if that makes a difference.
Cheers,
Sean