"Interactive" PowerShell deployment when it's not supposed to be

Has anyone seen this when deploying a PowerShell Package?

In Win7, it shows the following:

and in WinXP it shows an empty PowerShell console.

I've checked the delivery method and it's set to "Hide all feedback from user". I've even tried adding to the command line options "-WindowStyle Hidden -NonInteractive" to no effect.

If I use VBS or if I use a CMD package to do the same thing that PowerShell is doing, it works as expected without popping anything up. Any ideas?