“Blog” misspelled!!?

I have Firefox 2.0 installed, with its built-in spell-checker. Now apparently when I say 'blog', it thinks I must've meant one of log, bog, slog, clog or flog. I've added it to my dictionary (which is "English (Australian)", by the way). I also have American and British installed, just like I have the English keyboard layout installed as a spare, so I can easily switch and type £ quite easily. 🙂