Hi Wes,
Stephen I’m having the same problem as @ContextDesign, but I traced it to having SL Field Formatting and SmartDown installed at the same time. When I remove that plugin everything works fine.
This sounds like an awful lot like this problem, caused by SmartDown being unable to load the required Markdown Extra and SmartyPants classes.
So, questions:
1. Have you moved the system directory to another location? Above the web root, for example?
2. Have you checked the permissions on the `smartdown` folder (and its contents) in the `plugins` directory?
Cheers,
Stephen
P.S. Once this question is resolved, I’ll be officially “closing” this thread, and moving all support to here. Just a heads-up.