Created attachment 103668 [details]
Screenshot of the error

When I select all the text in my document and go "tool > Spelling > Spellcheck Selection", a message box appears simply saying "Check Spelling" (see attachment) and after clicking "ok", no text (even some voluntary mistake like "qlskjdq") is highlighted and the status (?) bar at the bottom becomes a mixed between a semi transparent text about some misspelled words and information about the file being edited (current line, current column, tab types, ...). See the second screenshot for more details.