Description of problem:
Trying to run simple-scan as a user always segfaults. Works as root.

Version-Release number of selected component:
simple-scan-3.18.2-1.fc23

Additional info:
reporter:       libreport-2.6.4
backtrace_rating: 4
cmdline:        simple-scan
crash_function: page_view_get_pixel
executable:     /usr/bin/simple-scan
global_pid:     7388
kernel:         4.4.3-300.fc23.x86_64
runlevel:       N 5
type:           CCpp
uid:            1089600001

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 page_view_get_pixel at /home/bob/bzr/simple-scan/3.18/src/page-view.vala:141
 #1 page_view_set_pixel at /home/bob/bzr/simple-scan/3.18/src/page-view.vala:313
 #2 page_view_update_preview at /home/bob/bzr/simple-scan/3.18/src/page-view.vala:502
 #3 page_view_update_page_view at /home/bob/bzr/simple-scan/3.18/src/page-view.vala:533
 #4 page_view_render at /home/bob/bzr/simple-scan/3.18/src/page-view.vala:826
 #5 _book_view_draw_cb_gtk_widget_draw at /home/bob/bzr/simple-scan/3.18/src/book-view.vala:456
 #6 _gtk_marshal_BOOLEAN__BOXEDv at gtkmarshalers.c:131
 #7 gtk_widget_draw_marshallerv at gtkwidget.c:985
 #8 _g_closure_invoke_va at gclosure.c:864
 #11 _gtk_widget_draw_internal at gtkwidget.c:6824