Cannot redirect Powershell output using Task Scheduler

I'm running Windows Server 2008 Enterprise x64 R2.

Sample script x.ps1:

Run this in the cmd console:

powershell -command ".\x.ps1" *> x.log.  Works like a charm, I've got a log.

Now delete x.log.  Create a scheduled task with the exact same command:  powershell -command ".\x.ps1" *> x.log.  Run the scheduled task.  No log.

WTF?  How hard should this be?  I've spent hours Googling, I know this problem comes up a lot.  Why is a scheduled task so different than running from a cmd console?

I also tried powershell -file, as well as Start-Transcript, which looked promising, but I don't like the line wrapping in the scheduled task output.