indesign/helvetica font not working

[djsound]

First off I am not sure if this is a Apple or Adobe problem. I did a publication in indesign cs5 using Helvetica. I do have helvetica on my Imac because it comes installed on it. It is a .dfont. So when I got o export it says that helvetica is a missing font and to substitute it...do .dfonts not work in indesign or something? I dont get it....

Is there a place I can get Helvetica in a different format from since it is a font that comes installed?

I have to send this project today and I can not change all the fonts....thanks

 

[radug]

the .dfont should work. Try clearing font & other caches + a system restart.

 

[djsound]

Strange. How do I clear the font cache? thanks