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You mean you formatted your computer, as in blew everything away; reinstalled Windows and reinstalled Sigil (the same version you had before)? Or did you install a newer version of Sigil that included a newer Qt? If the latter, it wouldn't surprise me at all if newer versions of Qt weren't pushing that particular video card to its limits.
Also, if you backed up your old Sigil preferences folder, make sure you try running Sigil without it restored first.
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