Are you using a fully qualified domain name to access UI Theme Designer and the application that is being themed? FQDN such as server1.companyX.com? Looking at the second screenshot, the top level domain appears to be .de. Be aware of requirements for such country top level domains, see SAP note 654982 for details. I remember once helping a customer with a similar issue. They were accessing their external URL that had the form server1.xyz.fi. The problem was solved by adding a dummy part as the 4th part of the domain, like app1.server1.xyz.fi.
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