XF 1.3 An unexpected error occurred. Please try again later.

Our site was up and running, http://www.ankenyikes.org, and now it's returning An unexpected error occurred. Please try again later. and I've got no idea where to start troubleshooting... help!

The database seems to be available, can connect using phpmyadmin without problems.
Failed to get controller response and reroute to error handler (XenForo_ControllerAdmin_Error::actionErrorNotFound)
An exception occurred: Mysqli statement execute error : Incorrect arguments to mysqld_stmt_execute in /homepages/11/d498404132/htdocs/xen.ankenyikes.org/library/Zend/Db/Statement/Mysqli.php on line 214

  1. Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 317
  2. Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
  3. Zend_Db_Adapter_Abstract->query() in Zend/Db/Adapter/Abstract.php at line 825
  4. Zend_Db_Adapter_Abstract->fetchOne() in XenForo/Session.php at line 719
  5. XenForo_Session->getSessionFromSource() in XenForo/Session.php at line 429
  6. XenForo_Session->_setup() in XenForo/Session.php at line 413
  7. XenForo_Session->start() in XenForo/Session.php at line 367
  8. XenForo_Session::startAdminSession() in XenForo/ControllerAdmin/Abstract.php at line 48
  9. XenForo_ControllerAdmin_Abstract->_setupSession() in XenForo/Controller.php at line 304
  10. XenForo_Controller->preDispatch() in XenForo/FrontController.php at line 346
  11. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
  12. XenForo_FrontController->run() in /homepages/11/d498404132/htdocs/xen.ankenyikes.org/admin.php at line 13
Yea, my host is 1 and 1 and changing the php version to 5.5 fixed it... 1 and 1 has utterly failed in this regard!