I have a Cisco 4510 switch that is not showing all the interface connections. Prior to upgrading NPM-12 I was viewing all my interface connections.
Try to go to Settings>License Details, check if you have installed active license on your server. You can also check the following link that explains how to use License Manager: SolarWinds License Manager
If issue still persists, I suggest you create ticket to Technical Support from your Customer Portal.
SolarWinds solutions are rooted in our deep connection to our user base in the THWACK® online community. More than 195,000 members are here to solve problems, share technology and best practices, and directly contribute to our product development process.