Commenting can be configured in a way that it is using intenseDebate (see http://intensedebate.com/, http://documentation.magnolia-cms.com/display/DOCS/Commenting+module, http://docuold.magnolia-cms.com/modules/commenting.html).
Beside other things, an IntenseDebate-ID must be provided in the configuration.
The template-script (magnolia-module-standard-templating-kit/src/main/resources/templating-kit/components/features/comments.ftl) which should read that ID doesn't work; the ftl-expression to read the expression is not working (anymore).

Beside the script the config. should be changed, too.
intenseDebateId-property should not be on /default/templates/prototype/areas/main/areas/comments
but on /modules/standard-templating-kit/templates/components/features/stkComments/parameters/intenseDebateId