Real-time Sheild problem

Today while testing some virus samples I happened to see something strange.

PLEASE test the sample in the sharing link.
http://www.sendspace.com/file/qp3ft1

password:virus

When the sample was decompressed from archive ,copied and even executed , Real-Time Sheild detected nothing;

but when this file was scanned manually ,avast showed a threat detected

\Kyti.exe [L] Win32:Delf-OFP [Trj] (0)

here is my avast real-time settings

Is this a bug of real-time sheild?

Tested and agree

File Shield cannot detect the malware as the scanner does, however the configuration may be.

Then that needs to be improved. I am using AVIRA in one of my other systems.Even while unpacking
it killed the file and moved it to quarantine. Next I disabled AVIRA , unpacked the file.Enabled AVIRA and clicked the file to run.It would not as AVIRA blocked that.And nest the scanner too recognised it. Might be that is the correct way…

I have not come to praise AVIRA. I have other grievances with them. But wherever the correct
course of action is to be applied it is suggested…