After investigating your installation I've discovered the following...
The minimalist required PHP version is PHP 5.2.6. I recommend PHP >= 5.2.10 (not PHP 5.3 though) with yours being PHP 5.1.6.
Also, NONE of your directories according to Joomla are writable; that is not good... they all should show green as writable. Please see Joomla Backend -> Help -> System Info > Directory Permissions.
You've errors within one of your content plugins: Warning: touch() Operation not permitted in ...plugins/content/jwsigpro/sigpro_engine.php on line 41
The ability to see READMORE of an article on frontend is also working fine. I've configured 1 article; see: World Champion's Angle (your first article). Click the READMORE and it'll let you continue to read the READMORE followed by asking you to subscribe to see the rest of the article.
I don't see any issues here other then issues with your site, but CBSubs is working fine and as intended.