If I click on the KDE Applications Launcher and then change desktops while the Launcher popup is visible, the Launcher popup disappears (normal) but then does not pop up when I click on the Launcher (bad); the Launcher behaves normally otherwise. This behavior is only for my account; using other accounts on the same machine the Launcher behaves normally.  When new launchers are installed on the taskbar they behave in the same way.

Any ideas on how to investigate?

System:
Fedora-27
KDE Plasma 4.11