In the globals file, make sure you check these two variables:
$WAGLOBAL_Admin_UserName and $WAGLOBAL_Admin_Password
Make sure that you are checking the values for the hosted site, rather than the values in the local copy. You may have made changes on your hosted site's globals file that you did not retain in your local copy.
Note: This is the login for the administrative section of the powerstore. Make sure you have that section uploaded to the server and are accessing that part of the site, rather than through the frontend pages.