diff -Naur pdfshuffler-0.6.0.orig/pdfshuffler/pdfshuffler.py pdfshuffler-0.6.0/pdfshuffler/pdfshuffler.py
--- pdfshuffler-0.6.0.orig/pdfshuffler/pdfshuffler.py	2012-04-28 16:15:17.000000000 +0200
+++ pdfshuffler-0.6.0/pdfshuffler/pdfshuffler.py	2014-07-31 11:44:04.075440225 +0200
@@ -1082,7 +1082,9 @@
     gtk.gdk.threads_init()
     gobject.threads_init()
     PdfShuffler()
+    gtk.gdk.threads_enter()
     gtk.main()
+    gtk.gdk.threads_leave()
 
 if __name__ == '__main__':
     main()