Had the same thing happening.
For me the restore to default doesn't work. When i click for example the V46 it directly reboots.
Was able to delete some mui stuff and Amibench started up again.
The installerNG did hang with ibrowse installation.
I did install a new installer (from aminet) and tried Ibrowse installer. After a few clicks it says need kick3.0 rom.
greetings from Holland.