TechMonster, then you missed the "Contact Us" form a couple times.
Please, download the latest plugin_manager and use the config.inc.php.dist file (copy it and rename it to .php)... that will allow you to install plugin_manager and get to Plugin Manager Center to download all our plugins. You will still need to use config.inc.php.example which carries the entire plugin_manager configuration if you want to really use it.
I could be wrong, but we have 6 different test servers to test our plugins before they are available in our mirror servers. I would dare to bet that there is no a single plugin in our mirror servers causing any type of issues with Roundcube's installations. Most likely you didn't configure your plugins properly.
Good luck and keep us posted.