steps

• Installed sbt 0.13.8 on Windows 7 64-bit.
• Went to a directory that has a simple hello-world sbt project (probably doesn't matter).
• From the commandline, called: sbt -Dsbt.log.noformat=true.

problem

• It says: Warning: invalid system property 'sbt.log.noformat'

expectation

• To not show this message, because the documentation seems to say it's a valid property.
  http://www.scala-sbt.org/0.13/docs/Command-Line-Reference.html

notes

• OS: Windows 7 64-bit.
• sbt: 0.13.8
• Screenshot showing the error and showing sbt version
  

workaround

sbt "-Dsbt.log.noformat=true"