Unable to download Podcasts from Itunes.

I can no longer download the podcast though itunes. Whenever I start a download an exclamation mark appears next to the podcast and nothing happens. This is the case with all of Giant Bomb's podcasts (Bombcast, Bombin' the A.M., etc...)

Never mind, it turns out it was a problem because I tried this fix: http://www.giantbomb.com/profile/szlifier/blog/a-fix-for-crappy-download-speeds-from-giant-bomb/100558/. I reverted it back to normal and I am able to download podcasts again.