In lost_pwd.php:

Replace:
Line 41: $query = 'SELECT id FROM ' . $t_user_table . ' WHERE username = \'' . $c_username . '\' AND email = \'' . $c_email . '\'';

With:
$query = 'SELECT id FROM ' . $t_user_table . ' WHERE username = \'' . $c_username . '\' AND email = \'' . $c_email . '\' AND enabled=1';

I haven't got a chance to test this fix, if someone confirms that it is working I'll commit it into CVS. Otherwise, I'll get to it later.

I tested your query, and it works correctly, with it set, I get the following on the lost_pwd_page.php

APPLICATION ERROR #1903
The provided information doesn't match any registered account!

Without the fix, I get the email sent correctly to the disabled user.

Fix works, go ahead and submit :)