When I'm prompted to sign into with my cable provider I cannot select one. Clicking on one does nothing. I've experienced the same thing on ESPN's website when I want to filter a list of scores by conference, for example. The drop down box doesn't respond to whichever option I click on. I've tried clearing my cache and disabling any extensions that may prohibit pop-ups, etc. I've made exceptions for websites and tweaked my anti-virus. Firefox is up to date and I've tried running it in safe mode. Sometimes, randomly it seems, I can sign in with no problem, although the ESPN problem is persistent.