Hello Michael,
The cluster jump should be set to "Unseen questions within a cluster", this is the default when you create a cluster page and you should not change it or the cluster will not work.
It is true that cluster only work for questions page not for content pages and to my best knowledge it has always been like that even in Moodle 1.9.
Even more if you put a content page between the cluster ad end of cluster pages it will alter the cluster working, this is because content page mark the beginning of a subcluster (see https://docs.moodle.org/28/en/Lesson_clusters#Sub-Clusters) so you should not do that if you don't want to use subclusters.
As I said to Mary the intended purpose of a cluster is to present a group of question pages in a random order to all students. No more no less
And I can add that the subcluster intended purpose is to present only one question page in a group of question pages to the student
So for instance if you have
Q1, C1, Q2, Q3, B1, Q4, Q5, Q6, EB1, Q7, EC1, Q8 (this example is extracted from the documentation)
where C means cluster, B means content page (that were named branch tables in Moodle 1.9), EB means end of branch and EC means end of cluster
- all student will see Q1 as first question and Q8 as last question
- all students will see Q2, Q3 and Q7 but we don't know in which order
- each student will see only one question picked at random among Q4, Q5 and Q6 and we don't know at what moment it will be shown to them between Q1 and Q8
- All students will see exactly 6 questions
- neither C1, B1, EB1 and EC1 will be displayed to student (Yes the content page B1 will not be displayed !)
Last thing, unfortunately in Moodle 2.8.4+, your problem when editing a cluster page that the jump is changed to "Next page" and the cluster is broken is still not fixed (it is already fixed in the future Moodle 2.9) but hopefully it will be fixed this week or next one because the fix is currently in integration (you can look at
MDL-48897 to follow the integration process and know when it is closed).
Note to all Moodle users: if you are interested in using clusters and subclusters in your lessons it is mandatory that you upgrade your Moodle to a very very recent release because I found numerous bugs while working on them.