Users may experience problems with the Java editor loading in SciFinder with the release of Java 7 Update 51 (1.7.0_51). Chemical Abstracts Service recommends that you add https://scifinder.cas.org to the Exception Site List, which you can find at the Java Control Panel. This is a new feature in Update 51 and isn’t available in the earlier updates.
More about the structure editor technical requirements (and non-Java alternatives).
SciFinder and Structure Editor Problems Java 7u51
January 23, 2014