[b]What can be done?[/b]
Turns out not much. Snow Leopard ships with a feature that was introduced in Leopard: Protected Fonts. What happens is if you remove or replace one of these Protected Fonts, Mac OS X will automatically place them back in the System Fonts folder. According to Apple these fonts are necessary to the operation of the the operating system and Apple’s applications. Removing any of these fonts can cause erratic behavior such as crashes and bizarre display issues.
One option is…
[b]Stop using Helvetica Neue[/b]
Honestly, if you are creating a project and you determine that there is no font that would work other than Helvetica Neue, you need to try harder. Helvetica is dead, and Helvetica by any other name (even if it is Helvetica Neue) is Helvetica. Time to move on. Apple made this font a system font in Mac OS X and if almost ten years of ranting against its inclusion as a system font has not changed their mind, nothing will.
[b]Get a new version of Helvetica Neue[/b]
[b]How to Disable Protected Fonts[/b]
We mentioned earlier that Mac OS X 10.5 up had a feature called Protected Fonts. To disable Protected Fonts for HelveticaNeue.ttc first need to navigate to the folder listed below:
and remove the HelveticaNeue.ttc font. I suggest archiving it in case you need to replace it in the future.