When adding a mobile device screen resolution you are unable to set it 3 characters width or above.
Change /Workarea/controls/DeviceConfiguration/AddEditDeviceConfiguration.ascx
Change MAXLENGTH="3" to MAXLENGTH="4"
see below...
"><%=_messagehelper.getmessage("lbl device preview width")%>:
px
"><%=_messagehelper.getmessage("lbl device preview height")%>:
px
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