Windows updated last night. The News & Interests icon appeared; the entire system tray disappeared including time and date.
If I turn off "lock the taskbar" I can raise the taskbar
Which shows they are there.... lowering the taskbar again brings the system tray to the top,
and a rollover with the mouse 'cleans it'.
So it's back. Hooray! But not for long because (and this is the freaky bit) when I open Outlook or Skype (and so far it's only Outlook & Skype) the system tray disappears again.
So. How can I get the system tray to stay where it's supposed to be; & / or how can I roll back last night's upgrade?