I set up an example here http://ectwp.com/Black-Tennis-Racket and found the simplest method was copying and pasting from here http://qaz.wtf/u/fraction.cgi?text=21+1%2F2
Hi Ken While researching your problem I copied and pasted the 1/8 fraction from the site you mentioned... http://unicodefractions.com/ When I did this, the HTML entity had an extra character inserted so the code for... ⅛ ...became... &#?8539; This caused the fraction to not display properly, but removing that unprintable character (which is displayed in text editors as a question mark) made everything ok again. I was just wondering if this could have been your problem too?