From the letter:
Montrail has received some reports of breakage on the Kumbu and I.C.E. 9 crampons. No injuries have been reported. Thhe breakage occured in the vertical reails of the forefoot portion of the crapon just aft of the point array. When the crampon breaks in this way, it will no longer remain attached to the boot or the function as a traction device on snow and ice and and could result in serious injury to the user.
You can call for an RMA#: 800-826-1598 M-F 8-5PST or email custservice [at] montrail [dot] com.
Montrail will provide postage and several reimbursement options.