I think this may be due to the dialogue issue described here here .
Standard dialogs do not work at all, such as a warning, confirmation, or prompt.
The login prompt that is shown to authenticate the user is probably blocked (not working or not showing), so the web application does not go through the authentication step.
I suppose Apple will have to fix this bug in a future version.
Edit: after upgrading to basic authentication, iOS 7.0.3 suddenly started working again in web application mode on the main screen. You will be prompted for input, and everything will work as expected.
Adhooo
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