Hi Michaël,
Yes, sadly it happens every time we run the apps. We always end up in West Europe, even for the Obvioos sample apps.
When you say your “service cannot locate the current user and start the app in the same region than the storage of the app” sure, though from what I can see, the browser is not actually being requested to provide the client’s location.
Could be handy for users to have the ability to set a default location in the settings?