Why isn't Google Analytics picking up visitors using IE?

I noticed around January 5, 2011, my Google Analytics account stopped detecting ANY visitors using IE. I didn't notice it until just now, but this concerns me, if only because it throws the rest of my stat-tracking into question if I'm missing what still amounts to 20% of the web browsing population. I don't recall doing anything special then to change how my analytics worked, though it's possible. Any Help?
Answer:

It's likely that there is a javascript error on your web pages that occurs only in Internet Explorer and that this error is preventing the proper execution of your Google Analytics tracking code. One possibility worth exploring is that a developer has left a console.log() or console.debug() statement in a piece of javascript. This will not cause an error in modern browsers but will throw a potentially debilitating error in IE. There are tools to aid with debugging javascript in IE, it would be worthwhile to investigate whether there are javascript errors on your pages. These errors, if present, could potentially be affecting the user experience of your site negatively as well, in addition to the impact on proper tracking.

Christopher ODonnell at Quora Visit the source

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