This is a short one.

File "[...]/eggs/Products.ResourceRegistries-2.0.3-py2.6.egg/Products/ResourceRegistries/browser/scripts.py", line 27, in scripts
 content = registry.getInlineResource(script.getId(), context)
 File "[...]/eggs/Products.ResourceRegistries-2.0.3-py2.6.egg/Products/ResourceRegistries/tools/BaseRegistry.py", line 840, in getInlineResource
 output = self.getResourceContent(item, context)
 File "[...]/eggs/Products.ResourceRegistries-2.0.3-py2.6.egg/Products/ResourceRegistries/tools/JSRegistry.py", line 246, in getResourceContent
 output = BaseRegistryTool.getResourceContent(self, item, context, original)
 File "[...]/eggs/Products.ResourceRegistries-2.0.3-py2.6.egg/Products/ResourceRegistries/tools/BaseRegistry.py", line 589, in getResourceContent
 method = obj.browserDefault(self.REQUEST)[0].__name__
 File "[...]/eggs/zope.browserresource-3.10.3-py2.6.egg/zope/browserresource/file.py", line 94, in browserDefault
 return getattr(self, request.method), ()
 AttributeError: 'DirContainedFileResource7' object has no attribute 'POST'

Check if some of your javascripts have inline rendering enabled and obviously disable it. This seems to be more like a work around rather than a fix. Haven’t had time to investigate what was really going wrong there. Any additional pointers welcome!