Leopard Mail 3.0 Bug? - Displays fractions in header instead of "to, from, subject"

When viewing a mail message (Version 3.0 (912.1/912) from a brand new Leopard install) both in the preview pane and when fully opened there are what appears to be a fraction typeface displayed in place of the words "to", "subject", "date", etc as well as the entire subject line. Preferences are set to default for "show header detail", and problem remains when this is switched to 'all'.
Checked preferences and all fonts are standard and available. Swapped some around to check and the header text is not user editable.

See screenshot here:
http://myskitch.com/danpatmore/magical-1.jpg___100___rgb_8__-20071026-221025.jpg

 

already tried the restart, checking and repairing permissions now.
can i clear font cache without a 3rd party app?
nice suggestions btw.

 

ok, onyx can apparently do it, but my verions isn't 10.5....but found this troubleshoot article:
http://www.creativetechs.com/tips/quicktips_04.html
and i'm going to try in Linotype Font Explorer to deactivate Helvetica Fractions which is my guess as the problem..

 

Easy as!
Helvetica Fractions was the problem, disabled and fixed without restart or even shutting mail.

Thanks for the tips.
I am going to look for font cache clearing now though.

 

No option I cold see in Linotype, and anything else I can find online isn't Leopard compatible yet.

http://homepage.mac.com/mdouma46/fontfinagler/

 

fontfinagler says on their download page that it will not work in Leopard at all yet.
Ahh, I see you're using Linotype. Cool

 

Yep, did system font cache clear which required a restart, and then application font cache clear.
All seems good now.

Thanks for the tips.