Hi,
I've also got this problem, and emailed Nigel at the gmail addr.
Machines are all Dell Optiplex 260, 270, 280, and GX620 FYI...
Many, but not all, have gone missing... BANGS and disconnected.
About 30% of my clients show exclamation points after the upgrade and the first task being run, which should have upgraded the Windows clients.
Also:
I use hard, not virtual, GHOSTBOOT partitions, and when just the boot partition is installed and attempt to force an upgrade by running a configuration task, the client appears to upgrade, returns to polling/acknowledged, but the icon in the console still shows the BANG and also indicates disconnected.
Re-imaging with the older version 1.1 bootpart restores the connection..
Some machines, which show only a MAC had a 'refresh configuration' task run on them, which failed, says client timed out. But, the icon name changed from the machine name to just the MAC... Some machines have upgraded, others have become disconnected.
The icon in the system tray show ok (no 'x') and the log shows polling/ack ok.