distributed.net had recently detected an infrequently occurring bug in the released CellBE Linux client that is primarily used for PlayStation 3 systems. The bug in the CellBE core only affects OGRp2 results by sporadically altering the node counts in completed packets sent back to the servers. No other operating systems or platforms are affected.
The nature of the bug allows to continue to rely on most of the OGRp2 results that have already been contributed by affected clients. However, to do so, distributed.net must make some back-end accommodations to require that the secondary validation pass be completed by some other non-CellBE client.