You can try changing the root password at the Linux prompt and then retry logging into the GUI with that password.  If it still fails, you'll need to remove the VM and redeploy the OVF file and install and provision the VM again.
Have run through the setup multiple times, setting different root passwords.   When I try to logon via the web page with root and the current root password all i get is "User not authenticated".  Have tried all the browsers with the same result.  Any ideas?  [IMAGE]
ESRS VE 3.04 User not authenticated on first web page logon