Some characters appear as white boxes with a black outline.
You can check the sample HTML page created with the PFR to see what characters were recorded. You must recreate the PFR to fix the problem. With WebFont Wizard, you can select the characters you want to record, from a single character to the complete character set. When you record the new PFR, make sure you have selected all the characters you need. Also remember that some fonts contain only uppercase or lowercase letters, not a complete character set.