I am running the most recent version of FF and Greasemonkey on this machine. I don't have any errors. Do you have any other scripts running on the play by play page? Perhaps disable all those, if you have any, and determine if that repairs the issue. Also, depending on which version you have, you may need to make a slight change to the code.
If you installed this one:
http://userscripts.org/scripts/show/87661Go to your monkey scripts and right-click on the rockitsauce script>>Edit
In the new screen Ctrl+f
Search for this exactly:
eval(data.slice(data.indexOf('var ptid'), data.indexOf('initialize'))); Replace that line of code with this exactly:
eval(data.slice(data.indexOf('var ptid'), data.indexOf('soundManager'))); Once you have completed this Ctrl+s will save the file and you can close it.
I am not sure this is your issue at all because if I don't make the change to the script it doesn't give me an error message, it just will not run.