I would advise installing my latest Simple Google Analytics plugin (PM me for in the info as I still have yet to upload the newest versions to the zen forums).
There are a lot of native problems with the way Easy Google Analytics was programmed that will cause it to stop working if it works at all on some sites. My latest plugin works flawlessly and is installed on a number of sites from 1.3x to 1.5x and it works fine. Don't download the version in the plugins section of zen cart as that was updated by several people over the past year or more and it has a few issues as well.
I'll look for your PM and will hopefully be able to upload this latest version to the zen cart site soon.
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