SymptomsThere is key option Ability to use Sitebuilder shown on the License Management page in Parallels Plesk Panel version 9.0.0. What does it affect?
ResolutionThe option means usage of Mabmo (old site builder used in Parallels Plesk Panel).
It does not affect normal integration with Parallels Plesk Sitebuilder and will be hidden on License Management page in next version of Parallels Plesk Panel.
Refer to the following article for details about how to enable Sitebuilder support for domains in Parallels Plesk Panel version 9: http://kb.sp.parallels.com/en/5907