Thanks for the response,
Unfortunately, I am already using org.drools.eclipse_5.4.0.Final in my plugins. I updated Eclipse and used http://download.jboss.org/drools/release/5.4.0.Final/org.drools.updatesite/ as well, but the problem persists. Do any other possible causes come to mind?
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-752221-19155/310-257/embedded_subprocesses.png
