> my current machine uses KDE, whereas the other one used Gnome; but this can't 
> be the reason.

I am not saying it _is_ the reason, but it is certainly possible.  Markdown 
preview uses webkit2gtk which uses a lot of the G*[^1] infrastructure.  By its 
nature that isn't a focus of a KDE distro, so its possible that there are 
interactions between the G* libraries and the KDE display server.  Are you 
using a Wayland or X11 session?

[^1]: G* == GTK GIO Glib etc

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