I can confirm this bug. When using text mode, simple-scan shows the
scanned page correctly, but when saving as PDF, evince renders it
completely empty.

I attach a test scan, with my Canon LiDE 30. This worked fine in lucid
and early maverick, it might be correlated to the switching to 4 gray
levels?

$ evince /tmp/test.pdf 
Error (12878): Unknown operator ',760010'
Error (12893): Unknown operator ',200012'
Error (12904): Too few (2) args to 'cm' operator
Error (12878): Unknown operator ',760010'
Error (12893): Unknown operator ',200012'
Error (12904): Too few (2) args to 'cm' operator
Error (12878): Unknown operator ',760010'
Error (12893): Unknown operator ',200012'
Error (12904): Too few (2) args to 'cm' operator
Error (12878): Unknown operator ',760010'
Error (12893): Unknown operator ',200012'
Error (12904): Too few (2) args to 'cm' operator
Error (12878): Unknown operator ',760010'
Error (12893): Unknown operator ',200012'
Error (12904): Too few (2) args to 'cm' operator

(not sure whether the error messages are related)

The top part is really blank, I scanned a post card from a magazine.

** Also affects: simple-scan (Ubuntu Maverick)
   Importance: Undecided
       Status: Incomplete

** Tags added: regression-update

** Attachment added: "broken PDF"
   
https://bugs.edge.launchpad.net/simple-scan/+bug/644734/+attachment/1683894/+files/test.pdf

-- 
Bad PDF from new versions of Simple Scan
https://bugs.launchpad.net/bugs/644734
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