I rebooted, and no change. I'm getting the same error.

> But if you have done some kind of lockdown process on your machine's tmp folder you may need to set that back to its original permissions in order to get MoI to run.

Please, can you be a little more explicit? I can't find any tmp folder in my system. I have a MacBookAir 13" from 2010 with OSX 10.7.1