Why i can not mount my USB stick automatically?

[Richard van der Veen <richard.vd.veen@gmail.com>]

Hello I use Debian Sid and i used to have this configuration that whenever i 
put the USB stick into the computer i see a window opened to let me choose if 
i want to mount the stick and see its contents. But after some updates this 
behaviour is not working anymore ... the window still pops up woth this 
question but when i try to mount the usbstick i get a cryptic error message 
and i don't know in which configuration file i have to search to make some 
changes ... can someone help me? ... The error message is:

A security policy in place prevents this sender from sending this message to 
this recipient, see message bus configuration file (rejected message had 
interface "org.freedesktop.Hal.Device.Volume" member "Mount" error 
name "(unset)" destination "org.freedesktop.Hal")

Thanx