Prior to upgrading I had no problem with the proper email address being used for all automated email messages. I have not made any changes to these settings, yet all automated messages are now sent using my ISPs generic domain email address for example - mydomain@myisp.com.

I have tested changing the Global Configuration to use PHPMail, SendMail and SMTP, yet none of them work right, they all use an email address generated by the ISP as the sent from address.

The reply to email address however appears to be working correctly. I have also double checked the email address settings in CB Configuration and they too display the correct email address that I need used.

Any idea what the problem is here?

Yes, I did all of that - I finally got it to work with a local email address, which I did not have to use before...