Try this…
Make sure your Cubase and EZD2 are both set to “Run as Administrator”. These settings sometimes get changed especially when upgrading software. To do that right click on the Cubase icon and, under the “compatibility” tab click on the Run as Admin box. Do the same with the stand alone version of EZD2. Right click on the Icon (it might be in the PC start menu).
Try that first and hopefully you will be all set. If not, then there are some preference settings under midi>import that we can look at too.
Please report back if this works or not. Thanks.
Regards 