Chrome interferes with KDE

[Jerome]

[Fedora 34]

After 70 days of uptime, Chrome (prior and latest version) is interfering 
with:

- opening apps from the QuickLaunch panel
- opening Gwenview from a KMail link to an image
- Ctrl-Esc for System Activity

When Chrome ISN'T open - all these work.

When Chrome IS open:

- nothing opens from QuickLaunch, or the requested app (eg: KWrite) coredumps
- Gwenview crashes
- Ctrll-Esc doesn't open System Activity

I've done a   plasmashell --restart &   and that hasn't made a difference.

Has anyone seen this behaviour before?