pdm_webcache will not help here
you need to use
pdm_cache_refresh -t Change_Request
as show in my previous post
Clearly you import file must have something wrong and/or not comply with the new release
try to use pdm_userload using -v in stead of pdm_load to receive errors back that may help to troubleshoot your files.
to you have any errors in your stdlog when you try to view your list in the UI after the load?
/J