shutdown or standby show no reaction when using the power menu

[tpenndorf]

Sometimes, when i click on power menu -> standby, nothing happens.
when i click on shutdown, the dialog, asking for shutdown or reboot opens, but after clicking on an options, the dialog disappears, but nothing happens.
At the journal, i found this:
wingpanel[17546]: Indicator.vala:151: Unable to suspend: GDBus.Error:System.Error.ESTALE: Stale file handle

i can reproduce it with the following steps:

• start E OS
• login with user A
• at the power Menu choose user B
• login with user B
• at the power Menu choose user A
• login with User A
• at the power Menu try to choose User B (you can't choose it anymore)
• at the power Menu, choose standby Nothing happens an in the journal, there comes the stale file handle message
  temporary workaround?
• logout user A
• at the login screen, standby or reboot also will not work
• enter Password for logged in User B
• at the power menu, choose standby PC will go into standby

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