adt hangs when packaging a native app for windows but not mac

We have a very simple animate project which includes a little over 1 gigabyte of media assets. Packaging and signing the app on a Mac works as expected. Packaging and signing on a PC for windows hangs. No error messages.

I have also tried building an airi and using adt.bat but end up with the same result.

Have tried with both air 26(included with the latest version animate)  and the latest release version of air 29.

Any suggestions or insight to help me get this working would be appreciated.