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The Problem:
Content authors enter special characters like the registration symbol either using the proper HTML for the symbol (®) or by clicking the the symbol in the character map from the TinyMCE toolbar. The proper HTML for the character is then replaced by an encoded character which renders as question marks (??) in the UI.
The Solution:
Open the file /sites/all/modules/tinymce/tinymce.module
Find the following function:
Within that function, find the following line and remove it or comment it out:
Conclusion:
HTML character entities are being replaced by the plug-in with character codes from a local encoding whether the character entities are entered using the Character Map tool or by directly editing the raw HTML. Removing this line stops the TinyMCE editor plug-in from replacing proper HTML character entities with local encoding.