Try running gthumb under strace, from a terminal:
$ strace -o /tmp/gthumb.strace gthumb
reproduce the hang, press Control+C in the terminal to stop gthumb, and then send us /tmp/gthumb.strace
Try running gthumb under strace, from a terminal:
$ strace -o /tmp/gthumb.strace gthumb
reproduce the hang, press Control+C in the terminal to stop gthumb, and then
send us /tmp/gthumb.strace