UPDATE: The maintenance is over, as of Jan 1, 3:30 am PDT.

We are upgrading our datacenter infrastructure. This will happen from 31 Dec 2014, 17:00 PDT to 1 Jan 2015, 01:00 PDT. (check for your corresponding time zone here). 

While we expect no downtime during this maintenance period, there may be a few intermittent connection issues.  We will keep you updated of this planned maintenance window in this forum thread, as well as from our social channel accounts in   Facebook  and   Twitter .