Answer to my own question:
I appears that Avast! antivirus was blocking the package process by refusing to run some Incredibuild executables without letting me know. I was able to package by disabling Avast! and I suspect adding an exception for the Xoreax program file directories should eliminate this problem, but I will need to confirm that.
Update: I have confirmed that this was indeed the issue and that adding an exception to Avast for the AndroidSDK and Xoreax directories resolved the issue.