X9.1.1 cannot add reference type in edit style>Footnote section>templates

yes, it does. sry, did not mentioned this.

everything worked out fine till 2 weeks ago. I made my own output style for german citation by an existing template (about half a year ago) which did not worked for me in the first place so I made some further edits time by time. I really have the same problem in every output file I open. Even when I downloaded the original one, which was fully functioning in the past, it did not worked eather. Chicago footnote which runned in the past is not working as well.

What I see: template is full empty – there were templates before – I go to dropdown menu and click on ‘book’ – but it is not adding anything to the list. Doing the same thing in citation or bibliography works.

when i restored the old file by time machine backup everything was fine for a while. but went bad after a few hours. now even restoring does not work.