Hello phil_m
The problem was, Cubase crashed before the Helix Native interface was displayed...!!!
However, after getting a response from Line 6 Customer Support and following the steps they detailed, I am pleased to report that everything is working again. The steps I followed were as follows:
Uninstall the Native Helix software ( Program Files (x86)\ Line6\ Helix Native\ Uninstall.exe )
Go to %appdata%\Roaming and delete everything in Line6\Helix Native
Temporarily disable antivirus and firewall (Norton 360)
Re-install Helix Native
Open a new project in Cubase, add an audio track and add Helix Native as an insert on that track
When the Helix Native interface appears, log into my Line 6 account
Everything now seems to be working ok for me.
Thanks,
Dave.