Comment # 3 on bug 1182527 from Adm Fubar

(In reply to Ludwig Nussel from comment #2)
> Probably related to your scanner driver rather than the front-end. You may
> want to get in touch with sane upstream instead. I can't do much here.

Recent boot drive failure may have been the cause. After replacement I've
recently scanned a negative. It came out positive as it should according to the
setting.

Several other hardware type issues had been occurring on my system, but were
resolved after replacing the drive.

Thanks for the quick repsonses.