I noticed Yahoo! checking the Who's Online page and found an anomaly in the URLs. Some links are:

...threads.php/ubb/page.html

and others miss out the ubb directory:

...threads.php/page.html

You'll need to update your list again and change the following:
  • Disallow: /forum/ubbthreads.php/ubb/online.html - Remove ubb/
  • Disallow: /forum/ubbthreads.php/ubb/showprofile.html - I think this should now be ubbthreads.php/users
  • Disallow: /forum/ubbthreads.php/ubb/search.html - Remove ubb/