I'd really like to stop reading Arial online, when I have the lovely Helvetica installed. Unfortunately, many sites specify their font familys as "Arial", "Helvetica", sans-serif, which means that I get Arial rather than Helvetica.
I had the idea to disable Arial and all it's cousins in Font Book, assuming this would work. Weirdly, this changes the font, but it still looks like Arial, albeit a different weight. These two images show the situation. (I've disabled Trebuchet MS to get this site to show the problem)
Interestingly, the Question title is in Helvetica, but not the Nav bar or the other sections.
Arial, Arial Black et al. disabled
As you can see, even with Arial disabled, it's still using a varient of it. Looking at the capital R in Rich is a quick test. This looks horrible on screen.
I've tried actually deleting the Arial fonts from /Library/Fonts, but this doesn't seem to make a difference.
Non Cocoa apps like Firefox don't have the same problem and respect the fact that Arial doesn't exist/is disabled.
How do I stop Arial appearing?
(EDIT, about a day later: Ah, seems that randomly it's started ignoring Arial when disabled. Didn't restart, it just decided to play nice...)