Wow Mike... you da man :P
I searched also for hours, but I did not recognize it.
My guess is that I messed it up during update from version 1.0.2 to 1.0.4
I had to do it all manually, since my AUTOMOD did not like the script (perhaps also due to the fact that we use a custom theme).
But all kudo's ...

I am sure I <CTRL> V'ed it...

But ok, another try http://www.metalrush.com/phpBB3/portal.php

I have a similar problem... I think...

If you take a look at our test-forum (am glad I have that possibility), you see that the left and right column are too wide.
I tried to find the file/setting(s) responsible, but could not solve it.
I also tried the header-file in this thread... not the ...