As I am back in front of the unit now I am having the same problems.
Laptop connected via crossover cable, Laptop ip of 192.168.11.2, subnet of 255.255.255.0. Widows firewall disabled, antivirus off.
I also can find the Unit with both NasNavi and lsupdater but again, when you try to update the unit nothing happens except everything except quit is grayed out and occasionally even quit is grayed out and I am forced to end the program. While lsupdate is unresonsive the is no network activity on my laptop or the Nas itself.
Only thing different is that my hostname is HS-DHGL-EM8A6.
What cause this situation for me was that I had no access to the web admin so I flashed to 2.21 firmware, I thought sucessfully, and the updater just never found the Unit after the update. Eventually it came back in EM mode.