Malenki found an error on my javascript where the scripts would be broken if google.com is disabled via noscript. Thanks to his good bug report with screen shots of his NoScript settings, I was able to fix the offending Javascript part.
Good thing is: Now, if one disables google.com via NoScript, the offending base layers are not offered for selection.
Things to learn from this: Better test your website with noscript too, even if 95% of its functionality really requires Javascript. You never know where some errors might come from 🙂