• VSCode Version: 1.1.1
• OS Version: Windows 7 x64

Steps to Reproduce:

1. Create the following files in VS Code (assuming creation of files in c:\temp):
   example.json

{
    "$schema": "file:///C:/temp/example.schema.json",
    "theme": "green"
}

example.schema.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "definitions": {
        "theme": {
            "enum": [
                "red",
                "green"
            ]
        }
    },
    "type": "object",
    "properties": {
        "theme": {
            "$ref": "#/definitions/theme"
        }
    },
    "required": [
        "theme"
    ]
}

After both files are created, modify example.schema.json by changing "enum": "red" to "enum": "blue". The change to the schema will not be reflected in example.json until VS Code is restarted (e.g. no validation errors appear with the now invalid enum value, intellisense hasn't changed).