Can't Install Drupal 8

My set-up:

PHP 5.4.28 and MySQL 5.5.36-cli running on a cPanel server with CENTOS 6.5 x86_64 virtuozzo VPS Apache 2.4.9

I tried both 8.0-alpha12 and 8.x-dev. They both failed to install and threw an AJAX error. I know the mysql installation process didn't finish because there were only 17 tables in the db after the failed installation.

On the same server, when I tried installing 8.0-alpha11 it installed without incident.

Any ideas on how to troubleshoot this?

Thanks,

Shai Gluskin