Command runs fine on command line but not from Task Scheduler

PowerShell 2.0 on Windows 7 64-bit When I tested out in a shell, the following works fine: ``` powershell -command { sleep 5 } ``` But when I have this in a Scheduled Task, with `powershell` in the Program box and `-command { sleep 5 }` in the Argument box, Task Scheduler reports "The operation completed successfully. (0x0)" but nothing is run. I had to record the screen with a video camera and then played back in slow motion to find out what is going on. After the PowerShell profile script runs, `sleep 5` shows on the screen with no error and PowerShell closes immediately. (Both my x86 and x64 versions have ExecutionPolicy set to RemoteSigned.) What do I have to do to make `-command` work in Task Scheduler? .