+1: I also have the same issue. By using PowerShell ISE it fails. When I use windows command line it works properly. I tried to integrate the command line it into my PS script by using cmd.exe /c ""..."" or cmd.exe /k ""..."" but it returns the same...
The command line release import and/or source control are necessary to automate the deployment between environments (dev -> test -> prod), I am personally really looking forward to it.
Currently the less painful solution is to create packages manuall...
