https://www.joomlart.com/forums/d/19279-conditional-hidden-fields-bug-in-recursion <= is not 100 % solved. So please read this before comming to the part what is still not working.
The hidden conditional fields show up now once you select the values they are conditioned on. That was solved in the upper link. What is still not working is, the initial load when i open a record.
so for example
http://playground.inseln-der-macht.de/administrator/index.php?option=com_dtregister&task=edit&controller=user&cid[]=3066
Last field before the barcode is Verpflegungstage. Once one is select there should apear: Verpfelgungsart, Verpflegungsallergien and once Sonstiges is selected in there should come a extra text field. In the given booking one of the days is selected. So all of the stuff should be loaded, once i open the record.
When I deselect the option and reselect it, i get the values.