I've tested most all of the plugins above that could have affected the feed except for the Psychic Search plugin. That plugin requires an account. I'm also not sure how two search plugins work together, but it may be that I don't understand exactly what the Psychic Search plugin does.
The url
http://profilingguru.com/podcast/ does work as your podcast feed, which is very strange. It almost makes me think your permalinks settings are out of whack. One way to check is to go into the permalinks settings page and click save once, which resets the permalinks.
A few other items you can check: 1. Make sure there are no funny rewrite or redirect lines in your .htaccess file in the root of your web site folder. 2. Try disabling each plugin one by one and then try to validate your podcast feed at feedvalidator.org to see if the 403 error goes away. 3. Download all of the plugins and do a search for the number 403 (if you can find out what plugin is setting the 403 error, I can further investigate that plugin with PowerPress to see what is happening).
The other URL you can use to access your podcast feed is
http://profilingguru.com/?feed=podcast. This does not return the 403 error.