Website problems after changing user

Under the ‘Manage Domains’ section of the Dreamhost Web Panel I changed the user associated with a domain, and checked the box to copy all the files to the new user’s subdirectory.

The site mostly works now but I seem to be having plugin and/or permission issues. The audio player plugin I was using isn’t working (see here and I get this Wordpress error message when working on posts:

“Warning: fopen(/home/.freya/username/ [function.fopen]: failed to open stream: Permission denied in /home/.freya/username/ on line 96”

Anyone have any ideas? Did copying the files mess up some permissions somewhere? If so, which ones and what should they be set at?

Any help is appreciated, as I know just enough to get into trouble but not always enough to get out of it.