Avast just blocked.... itself, and I'm beginning to panic! HELP

Just booted my PC up, and was expecting to see/hear avast tell me my files are updated, instead I got the typical pop up down by my clock in the lower right, and a window popped up about a virus or infection being blocked. I clicked it, and the Avast.com page comes up with the following info:

URL: http://files.avast.com/files/emupdate/20131217.exe
Infection: Win32:Downloader-TJK [Trj]

Anyone else have this issue? I don’t know if I should unblock this or leave it or if my AVAST will still update itself normally or what. This is the first time in 4 or 5 years of using Avast, so I’m at a loss.

I just got the same thing. Avast blocked their own update. It has happened before if you check Google.

http://forum.avast.com/index.php?topic=142972.msg1036784#msg1036784