I have 3 masters in circular replication. I run pt-table-checksum in one of the masters only. A->B->C->A
The queries do get replicated the "next" server B but I don't think they are being replicated "properly" to the third server C. The checksums are always identical to the B server.
We are using MySQL 5.6.17 and Percona toolkit 2.2.12. Also we are using mixed binary log mode in all three servers.