If I'm understanding well you are using the VM with WebCenter Spaces 188.8.131.52 configured with tthe Oracle WebCenter Content 184.108.40.206 provided by the Virtual Machine.
You provided content to WebCenter Content setting the security group Public and you aren't able to see this content in the Portal.
- Is the content status Released?. Maybe is in a previous step (workflow) or indexing issue and the content is not available in the weblayout.
- Each user logged to WebCenter Spaces gets automatically the PersonalSpaceRole (in case of a public user) and the PersonalSpaceAuthenRole. Check that both have Read permission to Public security group using the Admin Applets of WebCenter Content.
- Check that your applicationNameUser and applicationNameAuthenUser has rights over the Public security group. (application Name is the configured in the connection Portal - Content).
From my understanding has to be an issue of 1. because all the Public content is readable.
I hope this helps.