Hello, 

I have been using the test.authorize.net server for years w/o issues, and w/o the code changing, I just started getting an error 13, indicating that "The merchant login ID or password is invalid or the account is inactive."  I just processed transactions yesterday and I can login to test.authorize.net with my merhant login info.

Does anyone know if something is going on with the test server?  Has anyone else seen this?