I'm using Epson Perfection 4490 Scanner with iscan 2.21.0 and firmware installed with the ebuild media-gfx/iscan-plugin-gt-x750 taken from this bug report: http://bugs.gentoo.org/show_bug.cgi?id=277117.
When ever I'm trying to use pdf or jpeg as output format the program crashes with memory violation error. Other formats are working fine.
Steps to Reproduce:
1. emerge =media-gfx/iscan-2.21.0
2. emerge media-gfx/iscan-plugin-gt-x750
4. push the scan button and choose the pdf or jpeg as output format
The program is crashing just after scanning the marked part of the document or photo with memory violation msg. The scanner stops after this leaving the device in unstable state: the scanning device stops in the place when photo or documents ends.
Scanning should work fine (It does with newer version of iscan)
I manage to solve this issue by using newer version of iscan 2.23.0 with the same firmware (installed by the same ebuild). I will write separate bug report with bump version request, and link it here.
Version bump request: http://bugs.gentoo.org/show_bug.cgi?id=302624
new version in portage. I close that bug now. if your problem still exists, feel free to reopen.