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					Originally Posted by Arios  Roger,
 Could you use an older Sigil version (that worked adequately) to see what happen?
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 To be frank, I did not believe in this solution. Not finding anything better, at last, I tried it. I installed the Windows 32 bits 0.5.3 version of Sigil and used it with Wine on my Linux box. 
I created an EPUB file the usual way (LibreOffice - writer2xhtml). I opened it first with this above mentioned deprecated version of Sigil. 
The nbsp are here. 
I opened this file with Sigil 0.7.2(Linux 64 bits). 
The nbsp are gone. I must add that when the EPUB has been saved, it keeps its nbsp and does not play the same trick again. 
I will provide this thread with a small test EPUB so you can see if somebody can reproduce this.