Scanner showing poor quality scans since update to Karmic

[Dave M G]

Ubuntu Users,

I have an Epson GT-S600 scanner, which is the same model as the
Perfection V100.

It was working great, and then I upgraded to Ubuntu Karmic 9.10.

Now, when I scan something in Xsane or Epson's proprietary scanning
software, it has these coloured (blue and magenta) streaks in every scan.

I have uploaded a screenshot to illustrate the problem.
http://autotelic.com/Screenshot.png

I don't know if the problem is with Xsane or Ubuntu or what, but it
definitely the turning point was the upgrade.

Any advice on how to diagnose or fix the problem would be much appreciated.

-- 
Dave M G