This will clear the checkpoint warning.

version: 1.8.1.2

getcheckpoint
{
"synccheckpoint" : "c97d93428762f722af344e9e04dc1ad9d3609509573c5200a63b7e85eb22b4b6",
"height" : 760590,
"timestamp" : "2015-05-07 20:56:47 UTC"
}

This will get tested and documented and uploaded over the next few days.