Have you incorporated the updating of include files at program start into "Search the web for new versions at each program start."?
I've just updated to v1.6 and noticed the "Download updated include files if available online" option has gone missing from the Web Update section in Settings. I choose to have Spybot check for not only updated versions at program start, but also updated includes (in addition to immunizing each program start).
I hope you haven't removed that option entirely, but merely incorporated it into "Search the web for new versions at each program start." It would be most unfortunate for us who used that function if you have removed it. -kd5-