This problem has been solved. You can read my description of the symptoms below, but just proceed knowing that I wasn't actually sure of what the cause of the issue was.

To solve it, I stopped using the Cyberduck FTP program, and used Transmit3 (for Mac) instead, and it worked.

"So - I have a big question for anyone that has developed with c5. I am having problems migrating my site, and I now think the issue may be that when the site is uploaded, my FTP program is making the owner "sstrongman" as that is who I am logged in as when I upload the site. So, it would be overwriting any owners that the server uses to edit the files on the server through the owner www. SO, I wanted to ask, is there a way for me to search through my dev folder and see which files use a different owner/group?

Here are the errors I'm getting (stevestongman.com/test):

<b>Warning</b>: BlockView::include(/www/stevestrongman.com/web/test/concrete/config/../blocks/autonav/templates/header_menu.php) [<a href='function.BlockView-include'>function.BlockView-include</a>]: failed to open stream: Permission denied in <b>/www/stevestrongman.com/web/test/concrete/libraries/block_view.php</b> on line <b>265</b>

<b>Warning</b>: BlockView::include() [<a href='function.include'>function.include</a>]: Failed opening '/www/stevestrongman.com/web/test/concrete/config/../blocks/autonav/templates/header_menu.php' for inclusion (include_path='.:/usr/share/php:/www/stevestrongman.com/php:/www/stevestrongman.com/web/test/libraries/3rdparty:/www/stevestrongman.com/web/test/concrete/config/../libraries/3rdparty') in <b>/www/stevestrongman.com/web/test/concrete/libraries/block_view.php</b> on line <b>265</b>"