You don't reapply templates, you expand them. Normally this done with a /sbin/e-smith/expand-template template_name
Given that you aren't sure which template to expand, I'd recommend executing the post-upgrade event. This is a good, safe, event that will expand templates for most of the major SME services:
/sbin/e-smith/post-upgrade
When this finishes, execute the event:
/sbin/e-smith/reboot
Hope this helps!
Greg Zartman