Don't know if this as already been corrected.

When a new registered users in drupal try to access phorum receive a "user id not found" error.
I found the bug in the file phorum_connector.php,v 1.1:

the code:
if(!$result) {
// if the user is not in the phorum user table but has access,
// insert an entry in the Phorum user table for them
if(user_access('access forum')) {

must be changed with:
if(!$result) {
// if the user is not in the phorum user table but has access,
// insert an entry in the Phorum user table for them
if(user_access('access phorum')) {

forum --> phorum

Cheers

Luigi