Has there ever been incidences of one or more cancerous cells having all it's cell-death pathways and apoptosis mechanisms intact and functional?
Usually the cell death mechanisms are overridden and therefore oncogenesis. The pathway components themselves are not mutated. One classical case I can cite is that of Ras-oncogene. See this article for details. Usually the survival/growth signals (MAP-kinase) are activated with simultaneous inactivation of apoptotic regulators (Akt-pathway). A mutation of MAP-kinase component ERK can also cause cancer but apoptosis is nonetheless supressed because of the interconnections of these tow pathways in the gene regulatory network.
Whereas in the case of tumor suppressors, the cause of cancer is genomic instability and failure to initiate apoptosis.
This is pretty unlikely, since one of the most important steps for cancer cells is to shut off apoptosis and proteins which control it (like p53, BCL2 and so on). Cancer cells (especially when they are genetically unstable) acquire so much mutations and misregulations, that these would otherwise trigger apoptosis which would result in the removal of the cell.
This can look like the following (figure taken from here), when you compare normal and cancer cell: