If you run the Open and Save Editor demo and type in text containg exclamation marks. ie

Test!

Then save clicking the save button, it will come back as:

Test<

The exclamations will remain fine in the editor until you get the text using the Html property which return it with all the exclamations changed to "<" characters. If you do this in a debugger examination of the Html property shows the changed exclamation while the editor still displays them. Apparently the problem occurs in the Html get routine.