Folks were having problem using the balance of their credits as of mid day yesterday.  Intuit had been flagged but it is unlikely anyone will respond until after the holidays.

Time to put your people skill into practice if your clients get anxious.  If they are the type who want things done timely, they wouldn't have waited until Dec 31.  If they were extended for foreign earned income exclusion, etc., they still have time.  It's a major holiday and I haven't come across any client who expects to receive a return this time of the year.

Enjoy your holiday and take a break.