MAC shown incorrectly in OFED 2.1? How to fix?

We updated from OFED 1.5.4.1 to Mellanox OFED 2.1 (everything on CentOS 6.3 64bit). The installation went smooth, but now ipconfig ib0 shows the same MAC (different from before) on all nodes:

HWaddr A0:00:01:00:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00. This leads to problems.

I don't even know what to look for. The firmware still seems to have the correct values for the MAC:

mstflint -d 01:00.0 q

-W- Running quick query - Skipping full image integrity checks.

Image type:      FS2

FW Version:      2.30.8000

Rom Info:        type=PXE  version=3.4.151 devid=4099 proto=VPI

Device ID:       4099

Description:     Node             Port1            Port2            Sys image

GUIDs:           0002c90300184420 0002c90300184421 0002c90300184422 0002c90300184423

MACs:                                 0002c9184420     0002c9184421

VSD:

PSID:            MT_1060110018

How can we fix that?