Configuration: battery panel plugin ("XERVERIUS" branch), set to run xfce4-session-logout when an ACPI power button event is received. Pressing the power button again will cause a second "end session" dialogue box to be opened despite the fact that one is currently open. Shouldn't xfce4-session quietly ignore the request in this situation? (BTW, confirmed in -rc1 via #xfce.)
Reassign to xfce-bugs@xfce.org.
Bug too old, closing. Please reopen if you problem is still the same 10 years later :)