John M - are you still using VM 1.1?
I went into ps_authorize.cfg.php and ps_authorize.php and entered the API login ID manually. I replaced the variable and entered the ID on both pages. Each page has 1 spot that you can change.
ps_authorize.cfg.php
line 5 - define ('AN_LOGIN', 'A.net API ID');
ps_authorize.php
line 53 - <input type="text" name="AN_LOGIN" class="inputbox" value="A.net API ID" />
Worked for me