Thunar 0.4.1svn-r23151, xubuntu/edgy/amd64 Steps: 1- open Thunar 2- go to About Box 3- open a second Thunar then you can't select anything within the second thunar as long as you have not closed the about box in the first thunar...
Fixed with revision 23818. 2006-11-11 Benedikt Meurer <benny@xfce.org> * thunar/thunar-dialogs.c(thunar_dialogs_show_about): Modal about dialog seems to block all other windows as well. Bug #2545.