If you have insynchq.com Google Drive sync Application, you will find that upon start, it displays the icon in the app indicator area of the desktop menu bar. However, upon clicking the insync icon, it does nothing.
To overcome this, open a Linux terminal, and enter the following command:
To stop insync:
insync stop <enter>
To start insync with the functional app indicator:
dbus-launch insync start <enter>
Now when you click the insync icon in the app indicator, it will open the insync window.