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One of my URLs was wrong because the fragment identifier failed to match the value of an id attribute in my *.htm page and the reason it failed to match is that on my page I had used the hash mark as the first character of the value. This was my fault, but I suspect it's not an uncommon error. It would be convenient for page authors, if you find a match except for an excess leading hash mark in the link, if you tell us about that specific error. It will help us to feel stupid faster and to correct our link destination faster. The same would apply to a name attribute, even though that has been mostly deprecated lately. Possibly relevant is bug 37. For this bug report, I guessed the component and the version; the version is actually 4.81.