I created a little DataType with these fields: "Title" and "Text".
Then I add a new property to a DocumentType, with this DataType.

I create a new node of the DocumentType, but I look that the Grid does not works properly. I look only the label, a gray rectangle and "Add row" button.

Looking in Console of browser, i find this:

ReferenceError: index is not defined  
    at resetProertiesEditors (http://localhost:5555/Dependenc...

I found the issue in App_Plugins/u7dtg/u7dtg.controller.js, row 66:

// clean watchers before set again.
for (index = 0; index < propertiesEditorswatchers.length; ++index) {
    propertiesEditorswatchers[index]();
}

To solve, you can replace these lines with this:

// clean watchers before set again.
for (var index = 0; index < propertiesEditorswatchers.length; ++index) {
    propertiesEditorswatchers[index]();
}

After the update, it is important to delete the ClientDependency folder in App_Data/Temp to clear the cache of ClientDependency.