Sounds like you may be up against element binding which has been made much faster in the updates. More info on this topic can be found here (though I don’t think I directly cover the old versions): Element Binding in Revit
If you don’t see bindings in the file, or are lost due to the difference in file type (somewhat unlikely as it’s actually easier in 1.x) post the dyn file directly to the forum or a link to an external share service (Google Drive, Dropbox, Onedrive, Box, etc.) and I will try to have a look later today.