If I look at the VS debugging I can see the errors are caused by some garbage that is prefixed to the js.axd file.
With HTTP Compression enabled I see the following "js.axd?path=ï»¿var hoverClass = "AspNet-Menu-Hover";"
I've no idea where the "ï»¿" is coming from but I it's related to the compression - perhaps some minifying that occurs.
And this is what browser is complaining about.
I really would like to take advantage of the compression.
Has anyone come across something similar and any ideas of how to fix it?