If you find yourself having problems registering EMC PowerPath 5.4.1 (unsupported) or 5.4.2 (supported) on your HP blades running ESXi 4.1, consider uninstalling the HP offline bundle hpq-esxi4.luX-bundle-1.0. We did, and PowerPath was magically able to talk to the ELM server and retrieve served licenses. I have no idea why CIM-based tools would have this effect, but there you go. Apparently a fix is on the way from HP, but I haven’t verified that yet. I’ll update as soon as I know more.