Please share errors from the browser console or admin log (site.url/Admin/Log/List).
Error:
Error 404. The requested page (/Admin/RoxyFileman/ProcessRequest) was not found
Page URL:
https://localtest46.selectsystems.com.au/Admin/RoxyFileman/ProcessRequest?a=DIRLIST&type=image
Error:
Error 404. The requested page (/Admin/RoxyFileman/ProcessRequest) was not found
Page URL:
https://localtest46.selectsystems.com.au/Admin/RoxyFileman/ProcessRequest?a=DIRLIST&type=image
Yes, it was changed in the 4.60 version (commit). Looks like you forgot to update js files. The ProcessRequest route is no longer used.