I use Sigil 0.9.2, and I have the same problem
as originally discussed here. Any changes I make to my external stylesheet is not reflected in the view pane unless I close the program and open the file again. I've check my CSS and HTML again the version checkers, investigated CSS inheritance problems, etc., etc. I still can't get the changes to the stylesheet reflected to the html file without going through hoops.
This should be automatic, in my opinion. The stylesheet rules the document, and any changes should be immediately effected once you hit the save button (or even without, perhaps). At least there should be a REFRESH button that updates everything at that point.
I don't want to have to close tabs or the program--it drastically affects productivity.
I really don't have a solution or a particular sage piece of advice. Only airing a concern.
Thanks for reading!