incorrect icons on Kubuntu desktop

[Shlomo Solomon]

I have a few links to applications such as wireshark, krdc, Virtualbox
on my Kubuntu desktop.

For some reason, today all of these links no longer have the correct
icon but "look like" text files. Strangely, in each icon I can see a
"preview" of some text.

If I right-click > properties I see the correct icon.

If I drag one of them to the panel, the icon appears correctly on the
panel.

When I login, I can see the correct icons on the desktop for about one
second and then they all "magically" change to look like text file icons
again. 

Any idea what is causing this?

-- 
Shlomo Solomon
http://the-solomons.net
Claws Mail 3.16.0 - Kubuntu 18.04