After connecting a device (in my case, an Android phone), the Device Notifier doesn't always appear. However, the next time I click a different tray icon (reproduced with both Media Player and the Status and Notifications dropdown), Device Notifier appears instead of the desired applet. If I close Device Notifier and click the other icon again, the correct applet appears. Reproducible: Always Steps to Reproduce: 1. Connect a device such as an Android phone (you may need to then disconnect it and reconnect it). 2. Click a tray icon other than Device Notifier. Actual Results: Device Notifier appears. Expected Results: The applet corresponding to the clicked icon should appear.
Can you confirm your Plasma version ? You can find it in kinfocenter of your package manager?
Sure - according to KInfoCenter, I'm running Plasma 5.2.2.
Systemtray implementation is changed, this should be one of the problems fixed.