If you updated to latest Magento 184.108.40.206 or 220.127.116.11 version you may notice that Google Analytics implementation is broken. Here are few easy instructions how to fix this.
Navigate to and open app/code/core/Mage/GoogleAnalytics/Block/Ga.php and add this on line 179
var _gaq = _gaq || ;
Since this bug is already reported and fix can be seen on latest official svn, I don’t see any harm in modifying core files in this particular situation.
As Magento Team said, changes will be included in next stable release.