Eclipse can some times fail to load plugins. I have experienced this E3.7 with both ScalaIDE and GroovyEclipse.
In both cases some times the syntax highlighting fails. Also I have noticed some times plugin related menu items and popups do not appear. This is very much evident when you use the Pulse Eclipse distribution.
This is aggregated after using Eclipse of a while and going through a few updates. Some times a clean unzip and a download of the required plugin solve the issue.
Is there a way to get around these issues?