displaying rtf text in crystal report

I have saved some data in rtf format in my database using richtextbox control in vb which is correctly retrieved by the same richtextbox in a vb form. but when I call the same data (particularly those which contain maths equations or mathematical symbols etc.) then then I get very wierd display in crystal report even if i have changed text interpretation property of the report field to rtf text. How can i display rtf data stored in memo field of access database containing mathematical symbol in a crystal report? Any help will be greatly appreciated.
Thanks
Sanjeev