An update: I’ve found that the widgets are appearing on individual pages, but the homepage still displays Archives/Meta and is missing the widgets.
Are there different widget areas? So like a homepage widget area or a header widget area? Perhaps it’s hard encoded in your theme’s homepage template file?
Now, about two hours later, everything is appearing as it should, with no additional changes from me. I wish I could understand what/why it happened, though…
Thanks very much for your response, bemesign.
Cheers xx
Possibly a server caching issue…