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ASSERT: have some application running on OpenShift and listed in OpenShift Explorer
ASSERT: have some downloadable cartridge embedded to it (ex. use foreman: http://cartreflect-claytondev.rhcloud.com/reflect?github=ncdc/openshift-foreman-cartridge )
EXEC: in OpenShift Explorer: select your application and pick "Edit Embedded cartridges"
Result:
There's no entry for your embedded cartridge thus you cannot uncheck and remove it.
Expected result:
There should be an entry for your embedded, downloadable cartridge that you can uncheck.