We all are very well aware that wordpress's issue with handling the dreaded " " has been ongoing for over 6 years now... I don't understand why these threads keep getting closed on the forum when they're not resolved. Users everywhere, constantly complaining about the being placed where there should only be a " " (space)...
Here's a simple solution to the problem that will save you years of banging your keyboards in frustration>
CKEditor For WordPress. Simply put, this WYSIWYG rocks, and the TinyMCE is clunky, messy, and anything but tiny. The features that CKeditor is far superior to TinyMCE, in fact, I really don't understand why TinyMCE wasn't dropped a long long time ago for CK Editor. It's better in countless ways.
Ok, you can stop banging your keyboards now. Your Welcome.