Comment 10 for bug 1000526

Just triggered the problem with '1.1.3-0~ppa1raring'.

Steps:
. file->scan
. 'scan document' with 'fetching list of devices'
. then shows the hp deskjet at the other location that isn't reachable here
. main window shows 'opening device' at bottom
. 'scan document' window closes, and immediately:
. popup comes 'Error opening device: Invalid argument'
. close
. main window bottom still shows 'opening device' with a motionless ('stuck') blue part.
. file->scan
. new window pops up with title 'Scan Document' and nothing in it

quit gscan2pdf and restart, same result.

console output:

$ gscan2pdf
Gtk-Message **: Failed to load module "overlay-scrollbar" at /usr/lib/perl5/Gtk2.pm line 138.
Gdk-CRITICAL **: IA__gdk_error_trap_pop: assertion `gdk_error_traps != NULL' failed at /usr/bin/gscan2pdf line 8183.
Gdk-CRITICAL **: IA__gdk_error_trap_pop: assertion `gdk_error_traps != NULL' failed at /usr/bin/gscan2pdf line 8183.
ERROR - opening device: Invalid argument
Gdk-CRITICAL **: IA__gdk_error_trap_pop: assertion `gdk_error_traps != NULL' failed at /usr/bin/gscan2pdf line 8178.
Gdk-CRITICAL **: IA__gdk_error_trap_pop: assertion `gdk_error_traps != NULL' failed at /usr/bin/gscan2pdf line 8183.

I think the gdk_error_traps message has nothing to do with this problem, it's a common thing for gtk apps, see #1075928

ps: i'm using a kde4 desktop.