[Plugin: WP Super Cache] wp-cache not returning cache files

I have super-cache installed on my primary domain and two add-on domains.

It works perfectly with the two add-on domains including returning the wp-cache files for non-anonymous visitors.

Super-cache works fine with the primary domain. My wp-config cache statement is the first statement in the file. I have changed the permissions in the cache directory to 777 and also for the subdirectories.

I can see wp-cache file being created both in wpcontent/cache/meta and wpcontent/cache/

The number of files in the meta subdirectory equals the counter number on the settings page. There are many more wp-cache files created in the wpcontent/cache/ area.

I have tried uninstalling and removing all the files and deleting the cache directory with no change.

Everytime a non-anonymous user loads a page a wp-cache file is created in wpcontent/cache. I am not sure what trigger the wp-cache file creation in wpcontent/cache/meta.

In all respects the install is the same for my add-on domains which work fine.

But a wp-cache file is never returned after loading a website page or refreshing a website page for a non-anonymous user nor is there ever a wp-cache message at the end of the source file.

I have read everything I can find on this problem and cannot figure out how to fix it.

Any ideas or help is greatly appreciated.