Dunno what happens here. What you could try is uninstall everything, then delete any e-on folder in AppData (hidden folder), then delete any vue.reg file in your Windows directory.
Then reinstall Frontier.
This is for Windows only, if you're on a Mac, bet you'll know where to find these folders and files.
Then if it still doesn't work, then it must be a bug that needs to be reported with the Contact a technician button at e-on's.