Q: how to block pop ups on ipod touches

Where are you getting the ads? If in the Crush app, does that developer have a paid version available without ads?

Or can you upgrade the app via an in-app purchase to be add free?

It is a free app and the developer gets paid by the ads.

So this is on your computer. right?

I also had one, not sure what the deal is as it didn't show up when I dropped down my notifications so I'm not sure how it was sent.

On you computer make sure that you have the Ad Popup Blovk on.

Also try deleting browsing, history and cookies.

Mine had a little more verbiage and did not have the null at the top but that is what I received.

Mine went away on its own. Try a Reset: Hold down the home and sleep buttons, wait for the Apple logo, let go of the buttons.

That's it, your phone should reboot and the message should be gone.