Hellekin implemented stricter content security policy on neo900.org: to limit opportunities for cross-site scripting attacks, we now avoid inline CSS and JavaScript, and serve assets from our server only.

For context:
http://content-security-policy.com/

As a consequence, the block diagrams, that enthusiastically used every little feature that's now discouraged, stopped working for a few days. We've fixed it now.

Please note that, if you're using a localized copy, that the procedure for generating it has changed, too. The updated instructions are in:
http://neo900.org/git/?p=misc;a=blob;f=block/README

- Werner