When generating a monitor as a background job (via -AsJob), the system has to understand your imports defined by Add-PSSnapin and Import-Module. These must precede any other code and should be recognizable when terminated either by a line break or a semicolon. V1.0.0. is only accepting the semicolon, though.
Example:
This fails because two of the three imports are using line breaks:
Start-Monitor -AsJob {
Add-PSSnapin Microsoft.TeamFoundation.PowerShell
import-module foo.bar;
import-module xyz
Get-StaleTfsFiles C:\MyTfsRoot\Trunk
}