[steven522]

I first noticed this happening after I updated to the latest version (0.8.2 at this point) for Windows 64 bit.

I load in a single html file with each chapter set with an H1/H2/etc. code.
I generate the table of contents in Sigil to get the listing in the contents panel.
I then click the first chapter link in the contents panel to move to that chapter header.
I use the key combo command Ctrl-Enter to break the html into a new file at that new chapter header leaving the previous segments isolated and making the Chapter header the start of the large html file.
I click on the next chapter, Ctrl-Enter, etc., etc. until all chapters have been broken down to their own individual html section inside Sigil.

Now I have to be careful when going through this because a click on the next Chapter, say click on 12 from within the larger section that now starts with 11 and it will bounce me back to the previous clipped down chapter 10. I will have to make a second click on the chapter 12 link to move back into the larger html section and down to the actual chapter 12 header.

Many times I have realized that I have created extra blank html sections because I broke out a new html section from a prior section where the header was the first line of that section.