I have same problem.
Since glib update, Thunar (and SpaceFM) is not allowed to mount/unmount
devices.
First I receive a message about org.freedesktop.udisk2 promt me to
introduce the root pastword.
I search and I found several articles talking about policykit and I
update several related packages (mount, udisk2, policykit-1, gvfs, dbus,
...) and now Thunar only show me this message:
"Not authorized to perform operation."
So, I don't know what happens. Something was working fine, suddently
stop working.
Any ideas?
Thank you!
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