Many many folks who use Google Analytics to track their Google AdWords campaigns are reporting that Google Analytics is not properly tracking and attributing their campaigns properly anymore. That the campaigns and revenue tracking in Google Analytics, specifically for their AdWords campaigns, are being labeled as "not set."
I am seeing tons of reports on this on Twitter. Google AdWords has been replying to people that the engineers are working on it.
Google said "our technical team is currently investigating this. We'll update you when we have more information."
@KelsC14 Hi Kelsey, our technical team is currently investigating this. We'll update you when we have more information. -Jarett
— Google AdWords (@adwords) August 31, 2016
As of now, I guess we just wait until Google figures out the issue. Hopefully it is a bug and not a change in how the two work.