Exactly the same scenario with me.
Tried to set up a DD on Friday - didn't work
Tried yesterday - success!
One interesting bug - the first liine in the 'address' fields of the DD application converts all text to lower case. The other address lines don't!
ZeN 8000 Active
Data Rate: 8128 / 448kbps
SNR Margin: 17.0 db
Line Attenuation: 11.0 db
Vigor 2800VG