Shared clipboard stopped working after Fedora update

[Ojrdude]

I am running Fedora 31 on a Windows 10 Host (VirtualBox Version 6.0.14 r133895).

Guest Additions Shared Clipboard and Display Auto-Resizing were working fine until I updated Fedora through its Software Updater. Apologies that I can't say exactly what was in the update, but I'm happy to provide this information if somebody can tell me how to find it out.

Downloading and installing Guest Additions 6.1.0 restored the Display Auto-Resizing but the Shared Clipboard still does not work. I have checked that this setting is enabled in VirtualBox.

Running

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ps ax | grep VBox

gives me:

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   426 ?        I<     0:00 [iprt-VBoxWQueue]
    810 ?        Ssl    0:00 /usr/sbin/VBoxService -f
   3256 ?        S      0:00 /usr/bin/VBoxClient --display
   3258 ?        S      0:00 /usr/bin/VBoxClient --display
   3262 ?        S      0:00 /usr/bin/VBoxClient --seamless
   3263 ?        Sl     0:00 /usr/bin/VBoxClient --seamless
   3269 ?        S      0:00 /usr/bin/VBoxClient --draganddrop
   3271 ?        Sl     0:01 /usr/bin/VBoxClient --draganddrop
   4309 pts/0    S+     0:00 grep --color=auto VBox

where I notice that VBoxClient --clipboard isn't present.

If I run

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VBoxClient --clipboard

and then

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ps ax | grep VBox

again, it doesn't appear.

Running it in the foreground, with more verbosity i.e.

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VBoxClient -f -v --clipboard

outputs:

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Shared Clipboard: Starting X11 event thread
Shared Clipboard: Stopping X11 event thread ...
Shared Clipboard: X11 event thread terminated successfully
Error connecting to host service, rc=VERR_NOT_IMPLEMENTED
Service terminated abnormally with VERR_NOT_IMPLEMENTED
Running service failed: VERR_NOT_IMPLEMENTED

So I suppose this is the problem.

Any ideas how to get my Shared Clipboard working again?

[Tbox]

I encountered a similar problem, maybe it will help.

Initially I am running in runlevel 3 and all that copy and paste didn't work.

Later I started the graphical desktop at runlevel 5. In the desktop, for example open a firefox web browser, I can copy and paste from/to host.
Since the graphical desktop is also known as "X", it could be the cause of that error you showed.