App Store stuck in "waiting"

My Macbook Air came out of the box yesterday. It's last year's model, so I'm (attempting) to bring it all up to date before I start adding everything to it. Currently I'm running OS X 10.8.5, in part because I'm trying to download Mavericks but that's not the only program giving me trouble.

The app store is currently stuck looking like this:

There is no button for me to press to unpause it. It's just stuck "waiting."

I have tried:

- ensuring that I was logged into my account.

- re-downloading it.

- quitting the app store the usual way.

- restarting.

- quitting the app store using activity monitor

- ensuring that my virus scanner is off

- there should not be anything stuck downloading in iTunes because I haven't even opened iTunes yet.

Any other ideas?