It does - and I must apologize.
I had migrated my Windows setup from ruby 1.9.3 to 2.0.0 using the "pik" gem - which only copied the ocra gem, but (obviously) didn't update it.
Today, I was able to fire up that VM again, and install the latest versions of ruby 1.9.3 and 2.0.0 - and this time I made sure I'd do a fresh "gem install ocra pik".
I had "gem update"d the old 2.0.0 installation, and a first test run went through with only one warning:
"DL is deprecated, please use Fiddle"
As this is all Greek to me, I presume it's only a warning... (at least the Config vs RbConfig warning has disappeared now)
Thanks!