I wanted to share here the solution, since I have been able to fix it. Because I was using the recommended IIS solution I was implementing the URL Rewrite rules needed to implement this solution. Somewhere along the way, the inbound rule had the “NOT Match” regular expression rule selection made, instead of the “Match” regular expression rule. This caused the button to no longer function since the rule was not being met. Upon fixing the rule, everything started to work fine.
So the moral of the story is, make sure the URL Rewrite rules are correctly implemented … 