Avast blocking facebook applications

Hi Guys, recently I am having a big slow down when I try to access facebook applications or even after logging into facebook.

Other websites are still ok.

Upon checking, it seems that Avast is scanning www.facebook.com/ajax/chat and so the website just hang there.

There are no problems previously, it only happen this few days.

I have also submitted the problem to facebook developers.

I tried turning off the on-access protection, and immediately I am able to get into facebook applications again.

Running on the latest Avast Home Edition, with program and iVAS files updated. IE7 latest updates, I even done a recovery on my PC.

Any advice please?

this page does not exist here
something must be wrong with the facebook page you are refering too