Eugenio,
Your site is returning a number of errors.
Warning: include(wp-blog-header.php) [function.include]: failed to open stream: No such file or directory in D:\Inetpub\webs\angelworldit\wordpress\wp-content\plugins\tubepress_pro_3_0_1\src\main\php\scripts\ajaxEndpoint.php on line 17
Warning: include() [function.include]: Failed opening 'wp-blog-header.php' for inclusion (include_path='.;c:\php\includes') in D:\Inetpub\webs\angelworldit\wordpress\wp-content\plugins\tubepress_pro_3_0_1\src\main\php\scripts\ajaxEndpoint.php on line 17
Fatal error: Call to a member function get_results() on a non-object in D:\Inetpub\webs\angelworldit\wordpress\wp-content\plugins\tubepress_pro_3_0_1\src\main\php\plugins\wordpress\classes\tubepress\plugins\wordpress\impl\options\WordPressStorageManager.php on line 78
The first two errors are in regards to wp-blog-header.php not being able to find specific files.
Please verify that the path's mentioned about are correct.
Thanks!