My brother had the same problem with vent last night, friday 9/3/2010, and he updated vent and the problem was fixed. This is a rather obvious fix, but just thought I might put that out there as last night I also had a disk boot error that ended up being caused by a loose cable connection. I spent 2 hours trying to figure it out and almost lost all hope.
So just putting that out there

sometimes the obvious is overlooked cuz its too obvious