Team blog of the Microsoft EMEA support team for Analysis Services
Sorry for bringing up something not strictly related to our 'cube world', but more coverage can't hurt here :
If you have installed SQL Server 2012 Service Pack 1, or if you plan to, it is highly recommended to apply a specific subsequent update as quickly as possible.
This is announced on the official relase team blog, and full technical details and fix details are in KB 2793634.
The technical issue won't take place in every case, but when it does its impact increases over time, hence the recommendation to apply the update as soon after SP1 is installed as possible : better safe than sorry :)