I couldn't find this bug in bugzilla but I can reproduce it reliably on
my setup.
If I am working on a document that has been checked for spelling errors
and has none. I then create a spelling mistake by adding a 'z' in the
middle of the word. When I press F7, the dialog box pops up, informing
me that the entire document has been checked. The normal spellcheck
interface does not come up but the misspelt word is highlighted.
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http://www.unmusic.co.uk/amhs/ - alt.music.home-studio