In "Filter" - press "Reset to defaults" then change Horiz. and Vert. size to 1x, see if that helps.
Using horizontal and vertical centering under "Display" doesn't affect that kind of pixel width interference it only moves the graphics to the center of the screen.
In WB1.3 Windowed size 752 x 572 seemed to be the biggest before there's black around the WB screen.
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