Hi Lorenz
Actually what you did i dont know ? Just go to the widgets of you new installation and check there is some data or not ? If there is missing some data then add it again. If there is already data then once add it and check. Hope this may work for you.
For the slider problme. Just go to the theme options and have a look is there all data or not ? and once just check the url too. Is it your current url or not ?
If still you are getting the problem then send us your username and password in our contact-us . We will try to help you.
Regards
Sunil