You can even install the latest build of the app from here: https://build.phonegap.com/apps/1373249/install if you want to test.
Worked the first time. Unbelievable!
Now I have a question about your setup … since your proxy is at https://my.domain.com/os (rather than just https://my.domain.com), are you able to use the app? If so, how do you do that? (I.e. where does the “/os” go on the “New Device” screen?)
Thanks!