The Jenkins CVS Plugin doesn't detect labeled changes on a branch. Commits directly done on the branch are detected and shown in the changes list, but it doesn't work for labeled changes on the branch from e.g. HEAD.
Could it be related somehow to the way how the 'cvs rlog' command is being used during polling?
This happens at least since version 2.5 and leads to an unreliable system.
Windows Server 2008 R2, Jenkins 1.473, CVS Plugin 2.6-SNAPSHOT #37