Here's a fix. If you disable "stop forum spam" the log in problem is solved. This is 100% reproducible.
I know the code tweak seems to have solved it, but this is something worth looking into, as I have SFS enabled on my site as well.
"No matter where you go, there you are." "If you can't do something smart, Do something right" "There are three kinds of people in the world, those who can count, and those who can't"
