CloseApps switch causes program to open

I’m using the CloseApps switch to prompt the user to close Outlook 2010. If Outlook is opened, the switch works correctly. If Outlook is closed then it suddenly opens up along with an empty PowerShell window. In Software Center, the application status show ‘Waiting to install’ until the PowerShell window is manually closed. I’m using ‘Show-InstallationWelcome -CloseApps ‘outlook’ -PersistPrompt’ for this. Has anyone else seen this issue?