"Immediate Login" doesn't log user in

I have a Pressflow 6.15 site set up. I have logintoboggan installed and running and most everything triggers as it should, BUT my user is only temporarily logged in.

Here's the breakdown - and I'll give the fix - for what happens, but I'm not sure the exact culprit (nor am I sure I have the time to completely track it down).

Basically, logintoboggan_process_login gets called, generating a logged in user, however (and I'm guessing it's cookie related), once everything processes, drupal_session_commit (as Drupal is cleaning up) destroys the logged-in-status of the user resulting in an access denied after redirect.

The fix is 1 line. If you need a real patch for the file, I'll generate one, but it's absurdly small:

function logintoboggan_process_login($account, $edit, $redirect = array()){
global $user;
$user = $account;
+ drupal_session_regenerate();

watchdog('user', 'Session opened for %name.', array('%name' => $user->name));

This prompts Drupal to pass through all of the appropriate session opening, generation, etc that it would normally handle and fixes the issue. I can't guarantee I've tracked back all the symptoms (so it might not be the absolutely optimal solution), but it solves a significant issue I encountered with the "Immediate Login" functionality.

Hopefully that helps, and sorry I don't have time to provide more.