I had mega network issues post after installing 1.6.21
seems to be that the ipronto will maintain your network session info from the previous release, but the ipronto updated the network driver, hence the network wont work.
To solve this I had to clear the network info in the ipronto.
I did
switch off dhcp
reboot ipronto
ensure ipronto starts with no ip
restart dhcp
browse with ipronto

This way the ipronto collects a new session record rather than the old one.

Also a bit annoying at 5am ipronto tries to get epg
no network
10 minutes later ipronto tries to get epg
no network.
I got no no sleep till i unplugged and removed battery.
Surely you should be able to do a clean shutdown.

Arif