Ecommerce tracking is only provided within Google Analytics (not Adwords). Adwords tracks Conversions (but so does Analytics).
My module lets you track both sides. By default it enables you to track Ecommerce Transactions through Analytics (providing you turn that on within your Google Analytics account) and if you want to turn on Adwords Conversion tracking you simply indicated that in the Google Analytics Configuration (in the zen cart admin) and by putting your Adwords tracking ID into the space provided.
Which module was it? There are only two for Zen Cart and this one (Simple Google Analytics) is the more reliable of them. (The other module had native problems with Ecommerce Tracking I hear.) The only way Ecommerce tracking would stop suddenly using my module is if the tracking number was removed / changed, or something changed on your Adwords end.
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