Hi,
I'm unable to add a Root Template on the XMLTemplater Parameters window as displayed on screenshot below. Collapsing Sub Template or resizing window does not resolve the issue.
Versions:
FME Desktop 2017 RC (installed package: fme-desktop-2017_2017.0.0.0.17245-ubuntu.14.04_amd64.deb)
OS: Ubuntu 14.04