Note:
Google has changed the Analytics account to allow for monitoring of multiple sites, from one account.
So now your account number has an extra digit appended, e.g.
UA-64XXXX-1 for site one.
UA-64XXXX-2 for site two.
Make sure to use this complete number in your Zencart admin. settings for the Analytics mod. The default account ID shown in the mod is UA-64XXXX.