I'm on 7.0.3 of Idea (and alternately the latest Selena as I'm testing this) on OS X Leopard. I have Grails 1.0.2 installed, and also Groovy 1.5.4.
I created a grails application outside of Idea, and was able to point a Grails project to it. Most things work, however the GSP support seems broken, as all gsp tags are red. Recently, they worked, but only in getting the tag completion working, not the attributes inside the tags. I also created a new Grails project from Idea, and had the same issue.
I'm on the latest Leopard.
I removed all plugins from the Application Support directory and re-downloaded the JetGroovy plugin, but to no avail. The project is marked as a Grails project facet as well as Spring.
Am I doing something wrong or is this support currently broken? I'd love to see it functioning. Also, I removed idea.plist and restarted, hoping there were settings there causing trouble, but it seems not.