I'm working with a taglib (ScaffoldTags) and I upgraded from grails 1.0.1 to 1.0.3. There's a taglib call that loops over a set of objects, giving it to a tag body each time. In my tag body in the gsp, I was incrementing a page variable counter so that I could do even/odd row type stuff. Since upgrading grails, it seemed as if the changes I was making to the variable weren't sticking once the body of the tag finished. I've replicated this with a sample app that boils the scenario down to the essentials.
See the attached bug report. Run it and go to the main page where some gsp exercises the problem. Technically it's not a "testcase".
This may be related to GRAILS-2675