Hi Bob -- thanks for your input.
I have double checked all the design element settings you mentioned and everything is OK.
One thing I did notice is the in the 9.0 template (the one that has the Body field fonts functioning correctly) there are additional forms:
Reply with History & Attachments-9
These don't exist in the 9.01 template.
I have stayed with the 9.0 template design for the time being which is pushing out the Font changes correctly until I can get to the bottom of the issue. Any other thoughts on this would be appreciated.