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I'll go away and have myself spanked at once!!
I do actually bristle a bit at the 'user problem not AB problem'. I, too, have been Mac based for about 15 years both at work and at home, and also work on designing websites for clients so maybe I'm biased.
But there are lots of other major suppliers who admit they aren't Mac-compatible, including companies I've had hiccups with today - like Laterooms (who are working on the problem) and Hamptons. I guess we're only the 5% so we aren't that important commercially.
I run four different browsers and when I hit a problem I try those sites with all of them. Some work with the defunct Explorer, some with Mozilla, some with Safari.
On a brand new computer with wireless networking, hot off the production line and running a pre-loaded browser, I would kind of hope a current website might work.
Still, if any Mac users have any advice for the best possible browser or a way of getting round these problems, then of course it would be gratefully received.
Finally I have said I haven't had problems since; that was my first taste of AB, I didn't expect the comment to be posted rather than going to the webmaster (which will teach me not to tick 'I have read and understood..' boxes in future)..