I tried to post a comment, and when I hit Submit, I got directed to the home page, is that what other people were getting?
I'm thinking that possibly $PHP_SELF isn't getting set properly, so the form has no where to post/get to, so it returns to the home page by default.
Just a guess tho.
If you know some PHP, do a little test script for a few of the enviro variables to check that they are all functional.