Default Grails '/' controller mapping not resolving properly

This one has been driving me crazy today. Since upgrading to Grails 1.2 and Weblogic 10.3 the default root mapping for "/" stopped working. Here's what I have...

I have this URL mapping:

"/"(controller:"IGive", action:"index" )

I have a controller named IGiveController with an index closure

def index = {
    render "foo"
}

When I go to my application running in the embedded Tomcat and Jetty with http://localhost:8080/mycontext/ I get "foo" returned property. But when I build a war and deploy to Weblogic 10.3 I get a 404.

I downgraded to Grails 1.1.2 and it still didn't work on Weblogic 10.3 but the error was more descriptive

Could not open ServletContext resource [/WEB-INF/grails-app/views/index.gsp] 

So it seems like it's completely ignoring my URL Mapping for "/" but other URL Mappings that are deeper are working. Any clues??