On top of all the above, it is probably a good idea to find out what the character is. To do this, put the cursor in the editor window immediately after the character and look in the bottom right of the screen. Calibre will display the name and unicode for the character. In this cases like this, I find it easier to put the the cursor a character or two before the strange character and use the arrow keys to move through them until you find the invisible character.
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