Help with changing Podcast Image?

Hi,

I have been trying for quite sometime now to change my podcast image that is hosted on my RapidWeaver website. I have found under the page Inspector Advanced->iTunes->Channel Image. But after changing it here and waiting several months, the image never changed. I have changed it once before, over a year ago and it worked, however I can’t remember how I did it. I also removed the podcast image from where it was uploaded and replaced it there, but that also didn’t work.

Any ideas or suggestions would be extremely appreciated!

Thank you,
Michael

(The website is www.thevgisland.com. The podcast is The VG Island Podcast)