Problem with Dust Buster : white spots

When using Dust Buster at the image border, a white spot appears.
(see picture)
The resolution of my movies is not standard (eg 1652 x 1242)
The problem occurs on black and white and also color films.
No different settings change resolves the problem
Thanks
(see picture)
The resolution of my movies is not standard (eg 1652 x 1242)
The problem occurs on black and white and also color films.
No different settings change resolves the problem
Thanks