The UN is reported to have cut a chapter from a recent panel report on DR Congo in case it undermines the deal which ended the five-year war.
UN peacekeepers have been trying to maintain the fragile agreement
The chapter details the continuing plunder of Congo's mineral resources by Uganda and Rwanda, whose invading forces have officially been withdrawn.
They are said to be arming rival militias in the east of the Congo.
Some of the UN evidence has been questioned because of the way it has been collected and presented.
Part of it was collected anecdotally, and presented orally to the UN Security Council.
The report says Rwanda continues to train and arm the largest former rebel group, RCD-Goma, and cooperates with the governor of North Kivu province who runs his own militia.
Uganda's primary objective is said to be control of Ituri province, which is rich in resources including coltan, an ore which produces a vital component for cellphones and laptops.