Something similar happened to me a few months ago.
One day I noticed my Adwords campaign wasn't being displayed for the keywords I had targetted. In fact, it wasn't being displayed for any key words.
I doublechecked all the settings and found nothing wrong with my campaign --so I emailed Google about the problem. After a few days of waiting for a response (which never came), I called Google (yes, there's a number you can call for Adwords support --though they don't publicize it). After repeated attempts to talk to a human being, I settled for their voicemail.
A couple days later Google returned my call saying "a technician looked at your campaign. It is active now." When I asked what the problem was the Google CSR offered no explanation.
Long story short, Google Adwords support sucks!
Good luck!
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