I am having the same issue. Logged in today to see how a one week old campaign is going, and I have no data in analytics to support the spend on my adwords campaign. I am using the right accounts and have changed no settings. I even have data for the first day of the campaign (june 22) then on june 23, all data stops.

I need to be able to explain to my clients why I am charging them for clicks that never show up in their analytics now.

Also, on the adwords side of things, I now only have one profile URL, my companies site, which I have never advertised on adwords. All of my clients profiles are gone, and yes, my analytics and adwords accounts are linked.

Any help would be much appreciated. I have two days before my report is due to the client.