I updated to the latest JekyllBuild (1.0.3) before I always used the RC. After updating the parsing of codes (with Pygments) doesn't work anymore. I always get the following error:
C:/Ruby193/lib/ruby/gems/1.9.1/gems/posix-spawn-0.3.6/lib/posix/spawn.rb:162: warning: cannot close fd before spawn
←[31m Liquid Exception: No such file or directory - /bin/sh in 2012-01-17-test-post.md←[0m
I had the same issue. Seems there's a problem in Pygments.rb 0.5.1. By rolling back to Pygments 0.5.0 the error disappeared.
gem uninstall pygments.rb --version ">0.5.0" gem install pygments.rb --version "=0.5.0"
Hope this helps.