I installed this yesterday and am learning the new lingo, but the first thing I noticed was trouble bringing up html pages. It seemed that if I had brought the page up before and it was in my cache, the page came up quickly, but if I had never loaded that page, then either the page came up slowly or timed out.
So I disabled the Standard Shield and things went back to normal.
This morning, I fiddled with the settings for the Standard Shield. I went to Customize, then Scanner (Advanced) and fiddled with Scan Created/Modified files. First, I unticked default extension and saved it by clicking okay, then I unticked scan Created/Modified files and saved it by clicking Okay. Now I have it turned on again and All Files ticked and that seems to have "fixed" my problem.
Win2kPro, SP2(?) whatever is the latest, IE 6.0.2