what version of confluence you use? Label Cage 3.x works only for confluence 5.8.x. For version before 5.8 there is similar version 2.9.x of Label Cage.
Can tell something more about this problem? Do you have any errors in atlassian-confluence.log or in java-script console? Does this bug occur for earlier version of plugin 3.0.2/3.0.1?
I think that the best way is create issue in intenso service desk: https://intenso.atlassian.net/servicedesk/customer/portal/8
There is new version on marketplace. Probably it fix your problem.
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