cache/ssu/[and the multitude of sub-folders and sub folders of the sub folders and the files in those folders] need to be set to writeable.

resetting the cache worked.

If none of your links are working I would hazzard a guess that your .htaccess file is causing the issue as htaccess is acted on first.
If you have it telling browsers to look for and use to display something that is turned off that would cause a problem.

hth