RH10 WebHelp includes special characters in 508 compliant search

I am converting a RoboHelp 5 WebHelp project to RoboHelp 10 WebHelp and the project uses 508 compliant output.  When I click on the search tab I see special characters like $, %, !, #, etc. showing up as search words.  I have tried adding the characters to the Stop Words list and generating the output again but the special characters still show up.  Is there a way to suppress these characters from showing up in search?  The characters do not show up in the RoboHelp 5 508 output.  I am using IE8.