My apologies, I should have looked a little deeper. The Guvnor Event Log showed I was missing a class in my POJO Model JAR; I fixed that and now everything is working fine. --- On Wed, 12/15/10, Scott Mayne <smayne(a)webfinancialsolutions.com&gt; wrote: From: Scott Mayne <smayne(a)webfinancialsolutions.com&gt; Subject: Guvnor 5.1: Can't open assets - "Unable to validate package configuration" To: rules-users(a)lists.jboss.org Date: Wednesday, December 15, 2010, 1:50 PM Hi all, Using Guvnor 5.1, I'm unable to open assets and get this message: "* Unable to validate package configuration (eg, DSLs, models) for [CA.FH.BETACAU]. Suggestion completions may not operate correctly for graphical editors for this package. * Unable to get content assistance for this rule." I've searched around and it seemed like it might be related to https://issues.jboss.org/browse/BRMS-425 so I gave the user admin, package.admin and package.developer permission for everything, but it still pops up the same error. Is there any workaround/explanation/quick fix for this behavior?