HTML Editor in Data Bridge

I am having a problem adding special characters in the HTML editor in the Data Bridge extension using DW CS6.

Every time I enter a special character via the special characters button, it shows as it's supposed to do, but when looking at the text on a webpage it is showing the characters as one of the following depending on which character you are trying to input "Ê, ë, Ý, Ò, Ð,ß, Õ".
This is for all all character with symbols above the letter (i.e acute, tilde, grave, etc). It is even showing the following for the registered, (® instead of ®) and copyright (© instead of ©) symbols.

Pulling it back in the editor shows the character as it is supposed to be, but clicking on the HTML button shows the characters NOT the HTML code for them.

I need to get this sorted as I am building a site that is in both French and English and I don't have a French keyboard.

Is this a bug or am I doing something wrong in the editor?

Dave Wadley