I just re-discovered that I'd been using a custom style sheet for ebay, which I guess is the source of this no longer working.
It was given me in the old days when there was still an Opera community, so I can't just recall the dialogue as to how I got it/who from/why.
In case anyone stumbles on this thread, I just used the previous style sheet - which also failed (not surprising, as it failed ages ago).
So then tried NO style sheet - and success!
The only nagging doubt is trying to remember why I needed a special one in the first place... š