I have a project that fails with no errors in the output when running packagercmd but completes successfully when running exactly the same project file form the GUI - opening the file with the GUI, running through the options and saving to a new file yields no difference in the files.
It does create a package but reports a failure - the package appears to run but we have not verified that it is accurate. We will move ahead with getting a build out today by ignoring the failure state reported by packagercmd but obviously that is not an acceptable long term approach as it will ignore legitimate failures as well.
Thank you for looking into this. Please let me know if there is any additional information I can provide to help you reproduce this problem.