I'm running the same versions and not experiencing the same issue. You can try the following
- stop all the services from the Orion Services Manager utility
- launch IIS Manager, delete the site and the application pool
- Delete the SolarWinds folder under C:\inetpub folder
- Run the configuration wizard and use the 'run as administrator' option when you launch it
- click through the defaults.
this will rebuild the website from scratch and hopefully will clear the issue