Your side note just saved my day!!!
I've updated my 7608NI-E2 to 3.4.2 (which incidentally has improved things considerably!) but following the upgrade, it said reboot failed. Errrr.... panic. I then managed to force it to reboot myself, and when it re-openned, the user named had changed from...
For me, after forwarding all ports, and selecting Notify Surveillance Centre, the alarms weren't working until I both rebooted the NVR set up email alerts too. No idea why.
But I've been generally having a lot of fun trying to get the Hikvision NVR (7608) to behave itself. I note that my...