xsane

I successfully installed xsane and it recognized my scanner but the scanned images are full of artifacts - wide vertical lines and spots. I also got xsane working in ubuntu linux, installed in Parallels and it works fine. I compared the contents of the files / opt/local/etc/sane.d/umax* (its a umax scanner) to their counterparts in ubuntu and they seem the same. Is anyone using xsane successfully and does anyone have ideas what the problem is? Mike