diff stars are missing - you cannot star a diff at all. see https://extranet.atlassian.com/crucible/browse/FE/trunk/src/content/WEB-INF/jsp/committer/committer.jsp?r1=37865&r2=37933

in the breadcrumb star is a file star. Instead it should say

... > path > to > file > filename.ext : r1234 : r2345

where the is a star for the diff of revision 1234 and 2345, and the revision numbers should be linked.

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revision star is missing from the page which it would be most likely starred - the annotated view of a revision. see https://extranet.atlassian.com/crucible/browse/FE/trunk/src/content/WEB-INF/jsp/committer/committer.jsp?r=37933

the breadcrumb of that page should be a revision star:

... > path > to > file > filename.ext : r1234

where the is a star for the revision 1234, and the revision numbers should be linked.