@knowlesy27
I just took a look at your installation of WordPress, and I was able to reproduce the issue you described. Actually, the issue that you're reporting seems to be affecting many areas of your WordPress installation, and not just s2Member. It appears to me that one of two things are occurring.
1. You have another plugin or theme installed, besides s2Member, which is making attempts to intercept POST requests that occur within your Dashboard, and the routine that is intercepting these POST requests is getting hung up in some way.
Your PHP error log indicates there are existing issues with a translation plugin. So that might be worth taking a closer look at.
2. If you have already disabled all other plugins and reverted to the default theme, but the problem remains, it could be related to server configuration, or to memory allocation on your server. In which case you would need to contact your hosting provider and ask them why http POSTs that occur within your Dashboard are hanging. A review of your Apache error log should unveil the underlying cause.
See also: http://codex.wordpress.org/Editing_wp-c ... ted_to_PHP