[roger64]

@Toxaris

I let you check this by yourself. It looks it's a big EPUB, just only because it's coming straight from the converter with a lot of fonts and a complementary style-sheet that I ordinarily use. I did not modify it because it is important not to save it. I'll explain this at the bottom.

In fact, as you will see, it only contains a page of text with twelve (12)  

To reproduce what I saw.

1. Open this EPUB with deprecated Sigil (ex: 0.5.3). Check: there are 12  
Most important, Do not save!!!. Just close the EPUB.

2. Open the same EPUB with Sigil 0.7.2. There are no  
Most important, Do not save!!!. Just close the EPUB.

3. Open this EPUB with deprecated Sigil. Check: there are 12  

Now, if you save the EPUB with Sigil, it seems you will seal the   fate according to the version of Sigil.
- if you save first with a deprecated version : you will keep your  
- if you save first with 0.7.2: your &nbsp are gone for good.