v6.3.1, Ubuntu 22.04.4: works once or twice, then stops working

[pawsey-kbuckley]

Unpacked 6.3.1 tarball; ran desktop-intergration.sh

Have an Applications:Accessories menu item for Yubico Autheticator.

Invoking it from there sees the window appear, and an icon, or
system indicator if you like - appear in the Indicator Applet area.

Use the application

Quit the application

Rinse and repeat, however, typically on the third invocation, I
only see the system indicator appear in the Indicator Applet
area, but no window to display the code appears, and I can't
seem to "kill" whatever's running (and I can see processes
running) by clicking in the system indicator in the Indicator
Applet area, which does nothing.

Killing the head process will tidy things up to the extent that
I can start to use it, for a couple of times, all over again, and
it will fail in the same way again.

Prior to installing v6.3.1, the same Ubuntu machine had a
v5.1.0 which was installed via your launchpad PPA, and
although that never placed a system indicator in the Indicator
Applet area, it could be run as many times as needed without
stopping working.