Ultimate Translation / Languages & Errors

Hey guys,
1. Could you help me understand the differences between the Languages Plugin and the Translator Plugin. Is there one you'd recommend over the other if they're both essentially the same?

2. I installed the Ultimate Translation plugin, dropped it into plugins and activated sitewide per Andrew's comment in another thread. Choose a few languages and had it go through the translation. Can't get the widget to show and get the following errors over and over in my error log:

[Mon Jun 07 20:31:31 2010] [error] [client 173.57.89.95] PHP Fatal error: Class 'WP_Sequential_Task_Scheduler' not found in XXXXX/wp-content/mu-plugins/ultimate-translation-plugin.php on line 831, referer: http://outloudblogs.com/wp-admin/
[Mon Jun 07 20:31:31 2010] [error] [client 173.57.89.95] PHP Warning: include_once() [function.include]: Failed opening 'XXXXX/wp-content/mu-plugins/includes/wp-sequential-task-scheduler.php' for inclusion (include_path='.:disappointed:usr/lib/php:disappointed:usr/local/lib/php') in XXXXXX/public_html/wp-content/mu-plugins/ultimate-translation-plugin.php on line 36, referer: http://outloudblogs.com/wp-admin/
[Mon Jun 07 20:31:31 2010] [error] [client 173.57.89.95] PHP Warning: include_once(XXXX//public_html/wp-content/mu-plugins/includes/wp-sequential-task-scheduler.php) [function.include-once]: failed to open stream: No such file or directory in XXXXX/public_html/wp-content/mu-plugins/ultimate-translation-plugin.php on line 36, referer: http://outloudblogs.com/wp-admin/
[Mon Jun 07 20:31:29 2010] [error] [client 173.57.89.95] PHP Warning: include_once() [function.include]: Failed opening 'XXXXX/public_html/wp-content/mu-plugins/includes/wp-sequential-task-scheduler.php' for inclusion (include_path='.:disappointed:usr/lib/php:disappointed:usr/local/lib/php') in XXXXX/public_html/wp-content/mu-plugins/ultimate-translation-plugin.php on line 36
[Mon Jun 07 20:31:29 2010] [error] [client 173.57.89.95] PHP Warning: include_once(XXXXX/public_html/wp-content/mu-plugins/includes/wp-sequential-task-scheduler.php) [function.include-once]: failed to open stream: No such file or directory in XXXX//public_html/wp-content/mu-plugins/ultimate-translation-plugin.php on line 36
[Mon Jun 07 20:31:28 2010] [error] [client 173.57.89.95] PHP Fatal error: Class 'WP_Sequential_Task_Scheduler' not found inXXXXXXpublic_html/wp-content/mu-plugins/ultimate-translation-plugin.php on line 831, referer: http://outloudblogs.com/wp-admin/

Since the errors are all referring to mu-plugins should I move the plugin back into mu-plugins per the instructions or is there a line of code I should change to reference the new location?

URL = http://outloudblogs.com

Thanks,
Ricky