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If you guys care about your GPack referrals, you need to send off that email to Adsense support!
I was looking on the net for a while about this problem untill I found this forum topic.
Its kind of odd if you ask me.
Has to be a google problem, i'm sure, considering none of us altered our code, it just magically changed to firefox ads.
Prior to this 'technical glitch' while driving traffic to GPack referral links resulted in virtually no traffic to the FireFox product. Meaning that if foreign traffic goes to your website, Google geo-locates the IP or country setting of the user, and displays the relevant ad. Prior to this glitch, while displaying only GPack links, 2-3% of traffic was for FF. Now still displaying the GPack link to US-based traffic, 30% of my traffic is driven to the FF link.
If anybody looks at these stats a little more closely, they will see the same pattern as my client is not the only one experiencing this.
My guess is that whatever IP database Google is using to Geolocate the user is incorrect although it could be a bigger issue.
Part of the problem that I can identify is they are having issues determining what type of traffic is foreign - i.e. something wrong with their IP schema for foreign vs domestic traffic.