Yes, I had the same problem trying to remove an underline. My first reaction upon reading this thread was to wonder why Sigil cannot remove the css rule surrounding the text in question. However, upon thinking a little, I realized that Sigil has no knowledge of what the css rule is doing, so it cannot remove it, unlike removing standard HTML.
It does seem that it is something that should be documented, if for no other reason but to stop people from complaining about the "bug" in Sigil.
In my case, I am trying to show a person who has no HTML knowledge how to fix typos in an epub file using Sigil. In a case like this, trying to remove underlines, I'll have no choice it seems but to show them how to go into HTML view and remove the spanned css rule. Oh well...
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