Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

• Don't make any changes on the Safe mode start window.

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

I too was having this problem. I fixed it by following the troubleshooting advice on extensions. I had ghostery added which was blocking espn's scorecenter from updating. I added espn.go.com to Ghostery's whitelist and everything works now.

Just started getting this problem. After troubleshooting, I find that rather than whitelist all the trackers, you only need to allow "ForeSee" to get the scores working.