After the initial fanfare, here's an update. I can confirm that with the latest NVR firmware (3.4.91), email notifications using Gmail now work. So last night I set up motion, line crossing and intrusion detection on two cameras with email notification. This morning I received emails for all three. A check of the camera footage showed that this worked correctly. In playback mode, however, on the timeline that shows where events are taking place, only the motion detection blips appear. No line crossing or intrusion detection. I know from the footage and emails that these did take place and were detected correctly. There is a pushbutton icon on the web playback control that allows you to select what blips you would like to see in the timeline. This icon is disabled until you begin playback. Once you begin, the choices are Clear (The default), Motion, Line Crossing Detection and Intrusion Detection. If Clear is selected, you see nothing on the timeline (The lower one. The upper will be a solid Continuos recording blue). If Motion is detected, you see the red blips for motion. If Line Crossing or Intrusion Detection as selected, you see nothing.
So it's still buggy.