Unmanaged SEP 12.1.601.4699 clients fail to update new definitions by running LiveUpdate. The date remains at January 9, 2012.
Though analyzing the log.lue, it is seen that LiveUpdate has completed successfully but found no newer definitions available.
Version 12.1.601.4699 is a Beta release rather than an official supported release of the product. This beta used special definitions which are different from the certified SEP 12.1 contents currently available