No tray icon, no Skip or Postpone buttons, and window disappears on closing Preferences.

I used Workrave for years under Windows Vista and it was very useful.  When Microsoft stopped supporting Vista I switched to Linux.  Recently it occurred to me to see if I could get Workrave again.  

I installed it but there is no system tray icon, although I know it's running because it puts up the notifications.  Also the notifications don't have Skip or Postpone buttons, even though I  selected them in Preferences.  Also, if I bring up Preferences, the tiny window (with the timers) disappears when I close the preferences window, so after that (since there's no tray icon) I can't get at Workrave's controls unless I forcibly end the program using System Monitor and then start again.

I'm using Zorin OS 9 (a variant of Ubuntu, possibly Ubuntu Trusty, at least some things in the update window sometimes mention the word "Trusty") and, I think, the Gnome desktop environment - sorry, I'm a bit new to Linux.  What's the equivalent of Windows's System Information window, do you know?

Would appreciate some help with getting the wretched thing to work, please!  It's a very handy program if only it'll work.





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