I got the same problem too.
DNS, WEB, MYSQL, MAIL <= all down with a lot of errors.
I was forced to reinstall the VPS, after many attemps to fix the problems
@MRatWork :
Can you please create a detailled tutorial about upgrading from kloxo to kloxo-mr ?
Btw, this command 'yum replace mysql --replace-with=mysql55' is no longer working after updating yum.