Tracking traffic sources

Why does google analytics gives you a source you can't track?

[Dina_Jones]

Hi there,

I use google analytics and under traffic sources it usually gives me Direct traffic, Search traffic and referring sites traffic.

However, last week it started showing another source labeled 'other', the problem is I cannot click on it and find out where this traffic is comming from.

Has anyone had a similar experience, or has any ideas of what it could be?

Thanks in advance for your help in this matter.

Dina.

[phranque]

i wonder if it is related to this:
Google AJAX Powered Serps Kills Referals [webmasterworld.com]

[caribguy]

Those are the campaigns you track with

utm_source, utm_medium, utm_content and utm_campaign