Please describe the problem:
The Podcasts download directory is by default the user's home directory. If you  change it in the preferences window, it won't keep the value on the next run.

Steps to reproduce:
1. Open rhythmbox.
2. Select Edit->Preferences, and then the Podcasts tab.
3. Change the download directory location. Close.
4. Close the application.
5. Start it again. 


Actual results:
The podcasts download directory is back to its default value (users home dir))

Expected results:
The podcasts download directory should be changed to the new location.

Does this happen every time?
Yes.

Other information:
I actually started it with an old (fedora8) ~/.gnome2/rhythmbox directory. As it didn't work as expected, I deleted it and tried it again, the problem remains.