OK, I've installed Opera. No problems. But I don't like the font rendering or sizes.
I already have sub-pixel smoothing activated, and in Firefox, everything looks great. But in Opera it looks pixelated. However, no matter what I do to the fonts, there's no change. I've tried everything I can think of - I've manually changed every single font and font size. I've made sure my fonts and my styles are activated in Author Mode. But still no change.
What am I missing? It's probably something so simple.