Update 6 screws up xsane Preview

[DougB]

xsane 0.998; Epson Scanner 1240U.

Since updating from Up5 to Up6 the Preview window of xsane has been screwed up: it's totally blank except for a very thin strip along the top and left-hand side of the window.
Scanning works OK; but I can't see what I'm scanning until it's finished, so it's impossible to select the area to be scanned.
I've completely removed xsane and re-installed it. Makes no difference.