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Until now, Node Relationships has been using the following path to render the node edit form on child Modal Frames:
This may cause issues with other modules, as seen on this issue related to Hierarchical Select:
The problem is that some modules may rely on the node/add path to perform their job, because they "watch" for this particular path, or because the menu system will automatically load node.pages.inc.
If we can tweak enough the output of node/add so that it can be rendered on a Modal Frame keeping the context information that we need to perform our own job, then we'll probably solve compatibility issues with other modules.