[sane-devel] invalid argument

[Tzadik Vanderhoof]

I have a Brother MFC 210C on Ubuntu Dapper which I installed
using http://ubuntuforums.org/showthread.php?t=105703 . 
Everything was working great (both printing and scanning
using xsane) but somehow the scanning has stopped working. 
I tried uninstalling things and reinstalling, but nothing
has changed.

What happens is: xsane starts fine (which indicates that the
scanner is recognized OK), but when I click on Scan, I get
"Failed to start scanner: Invalid argument".  Any ideas?