After recent updates I can no longer go to any of my listed Activities. Steps to reproduce. Choose Activties - select and click on a specific Activity, Session remains on current Activity and does not change to the selected Activity.
It appears to have been resolved.
Cannot confirm/resolved for me too in: Distribution: KDE neon Developer Edition Unstable Branches KDE Plasma Version: 5.10.90 KDE Frameworks Version: 5.37.0 Qt Version: 5.9.1 Kernel Version: 4.10.0-32-generic
Thanks for the update; closing.