Version 5.7.1 of vCenter Operations has a problem displaying Data in Dashboards if you install the standalone Analytics Server with non english language settings. To workaround the problem add “Duser.language=en” to the vcopsWebService configuration and restart the service.
wrapper.java.additional.22 = -Duser.language=en
option to the Tomcat Wrapper config located in %ALIVE_BASE%/user/conf/tomcat/wrapper.conf.
net stop vCOpsWebService && net start vCOpsWebService
Update: VMware has published the KB article 2058431 with a official description of the issue.