I discovered that certain fonts were displayed in weirdly different sizes, and my beautiful mellow yellow was screamingly fluorescent, depending on which PC was used to view the blog.
I think I've fixed the problems, at least for those using IE. I'd appreciate notes from other browser users - do you see the flowers, does the colour look nice and unfluorescent, and do the fonts seem essentially uniform? I may try experimenting with browser-friendly code, if necessary.
Oh, and praise whatever higher being seems appropriate for MT user support forums!