I have two friends who both have recent iMacs running OSX 10.5. They both use Linotype FontExplorer to activate and manage their fonts.
However, when they activate the Helvetica Neue family of Postscript fonts (all of whose names start with a number - eg 45 Helvetica Light), it is substituted by Quark 7.5 with the System versions from the Helvetica.dfont family which seems to be essential to Quark, because if that font is removed, Quark will no longer launch.
Both of my friends would like to know how to solve this, especially as one of them distributes his partly-prepared files to his production team for them to complete the jobs on Macs running earlier system versions.
Is this a problem with the System, or with Quark 7? I can't work it out.