Signup Limit set to '1', signups won't close

I recently upgraded to Signups 6.x-1.0-rc6 and Views 6.x-2.4 so as to take advantage of the new access restrictions to the user/signups pages, as outlined here - http://drupal.org/node/367297

Only problem is that, once I upgraded I found during testing that nodes with a signup limit set to '1' aren't closing when a user signs up for them. I've checked the database and the close_signup_limit field is being set to '1' and the users are being added into the signup_log with a '1' being added into the count_towards_limit, but the status isn't changing.

Just messing around and looking at the code, I noticed that if I comment out the following lines in the signup_sign_up_user function in signup.module the node will close when the second user signs up.

if (!empty($signup->count_towards_total)) {
$node->signup_effective_total += $signup->count_towards_total;
}

I only tested this because I noticed those lines didn't appear to be included on my older version of the Signup module I had installed.

Once I got to this point, I realized I was over my head and needed to ask for help :)

Sorry if this issue has already been posted somewhere. I performed a search but couldn't find anything.