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Mandatory information about my setup:

Have I read the related troubleshooter articles above before posting (which pages?)? yes
Have I searched the tickets before posting? yes
Have I read the documentation before posting (which pages?)? yes
Joomla! version: 2.5.7
PHP version: 5.3.x
MySQL version: Server version: 5.1.65-cll
Host: stormondemand.com / a liquidweb co
Akeeba Backup version which took the backup: Akeeba Backup Professional 3.6.8 (2012-10-20)
Kickstart version used to extract the backup: Kickstar core 3.6.0

Description of my issue:

At backend Joomla admin login I get Fatal error: Allowed memory size of 50331648 bytes exhausted (tried to allocate 32 bytes) in /home/r3public/public_html/libraries/phputf8/utils/unicode.php on line 49.

So I had a 32MB config for memory and increased the memory and it went away. I navigate to a new page and a new me error comes back. We reset it to 48MB and when navigating to a new admin page I ge a differnt error.

At the sitefront end when I do the cleanup I get:
Fatal error: Call to undefined function mb_strlen() in /home/r3public/public_html/modules/mod_bt_contentslider/classes/btsource.php on line 134

Help! I have moved other sites to this new server without any issues. Should I have used kickstartPro?

I changed it to 92mb and backend works but get this on frontend Fatal error: Call to undefined function mb_strlen() in /home/r3public/public_html/modules/mod_bt_contentslider/classes/btsource.php on line 134.............................