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As a slight addition, this is how LabVIEW has always worked, by design. Prior to the "new" VI save format introduced in LabVIEW 8.0, retaining undo information across saves was completely out of the realm of possibility. You might (or might not) have noticed that LabVIEW does retain undo information across autosaves. Trust me, you would have noticed if it didn't. 😉 There are still some technical hurdles to do this for explicit saves. Enabling this functionality is something that's on our radar, but I make no promises as to when you might see it.