I guess it is not really obvious, but it looks like you need a special build of Blender to use OSL. I thought OSL was already built into blender as of 2.68 but I guess it has not been ‘officially’ included in the trunk.
Thanks for the clarification. The 2.69 official release has been difficult to work with and I have been using buildbot and some graphicall builds to proceed with my node based AddOn development. There were some node events broken in the official 2.69 release.
or you should paste the error message you got.
Thats the problem I was experiencing. Blender told me I had an error and to check the console but there were no messages in the console.
Do you know if builbot builds are compiled with all features or is it just hit or miss what features you get? A lot of the graphicall builds list what flags are enabled but builbbot does not.