browser settings for login

Is the issue isolated to a machine(s)? Have you tried to clear cookies?

Thanks for your prompt attention.

I said "users" originally but it is a machine issue.  Guest, admin, and valid users can login on some machines and not on others.  On the failing machines you get the login screen, enter valid credentials and then nothing else happens.  The app never starts.  So, I think this eliminates active directory, network access, etc.  I will try clearing cookies although the failing machines were trying for the first time to access my new release (10.7) of NPM. 

Turns out inconsistent browser and security settings outside SolarWinds are causing the differences.  The workaround, in our environment, that got IE-8 to work was adding our NPM server as a trusted site in our local intranet settings using https:.  Https: was not needed when invoking the app from the browser after making this change.