unthemed front page for unauthenticated user

Suddenly my front page does not theme for unauthenticated users. After loging in the theme works. I opened the site in IE, Crome, and Firefox to test. Depending on the browser I either get an un-themed page, an access denied message, or both.I'm using Front Page module and Acquia Prosper theme if that helps. I checked the logs at admin/reports/dblog and I see the following error logs:

Type page not found
Date Wednesday, March 14, 2012 - 15:55
User Anonymous
Location http://mysite.com/sites/default/files/css/css_69c89beb7c4a752d7a7c5bfe6d...
Referrer http://mysite.com/front_page?destination=front_page
Message sites/default/files/css/css_69c89beb7c4a752d7a7c5bfe6d5bd62f.css
Severity warning
Hostname 64.131.***.**
Operations

or

Type page not found
Date Tuesday, May 15, 2012 - 09:43
User Anonymous
Location http://mysite.com/sites/default/files/css/css_083a9a0ace7ce1460149d0c2dc...
Referrer http://mysite.com/
Message sites/default/files/css/css_083a9a0ace7ce1460149d0c2dc1cdb30.css
Severity warning
Hostname 24.148.**.***
Operations

any ideas?

I have not changed permissions, and I double checked anyways and all looks ok. I was working fine last time I checked so what could it be? I tried re-saving my theme setting but that did not help. The weird thing is that until recently I never had a 'css' sub-folder in the sites/default/files/ folder.

the following is a link to a screen shot of the unthemed front page.( I had to block out elements for non-disclosure reasons.)
http://imageshack.us/photo/my-images/256/printchatterfliphelping.jpg