Krusader: Copy/Move Dialog Not Visible in XFCE4

A few hints how to deal with the never-ending issue of Krusader's "invisible" copy/move dialog window...

The Issue

The problem with "invisible" Krusader copy/move dialog window is "older than Methuselah". Sadly, this issue happens over and over again... Anyway, the troubleshooting can start as follows.

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The (Possible) Solution

1. Check whether dolphin, kdebase-runtime and kuiserver are installed.
2. Run krusader from a console (command line interface).
3. Not sure why krusader is unable to start it itself, but it is necessary to run kuiserver5 manually if the following error occurs:

Couldn't start kuiserver from kuiserver.desktop: "Could not find service 'kuiserver.desktop'."
QDBusObjectPath: invalid path ""

4. In XFCE4, open "Settings" -> "Sesstion and Startup", select "Application Autostart" and click "Add" to add a new application to start (fill all fields with "kuiserver5"), confirm/close everything and re-log into XFCE4.

Hopefully, Krusader should display the copy/move progress dialog again.

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Final Note

I do not use Krusader anymore, as I found Double Commander which is an open source multi-platform two-panel orthodox file manager and which suits my needs better.