Hello,

  On the latest Cog VM and my image (not so latest), I don't seem to
be able to get and set some vm parameters.  Specifically, the ones
marked as "read-write" in the method comment give me "nil" when
queried, and some strange value when try to set.  Is this a known
issue?  And/or, Is there an image side change I should have?

  Thank you!

-- Yoshiki