Latest 9 WIP: I’m experiencing a wierd issue where I cannot un-delete deleted geometry. I couldn’t replicate the issue in a simplified file so far.

You may need to increase the maximum memory Undo can use. Options > General > Undo [image]

Let me know if you see more of this or can repeat it. We’ve made some recent changes to improve our undo tracking that might be related.

Interesting. I only deleted a curve with a few segments. The file size is 157 MB and I Rhino says I have not saved the file in 700 minutes which is not true. [image]

Did you try to undo immediately after the deletion of the curve?

Ok, I tried to undo directly after deleting and couldn’t get the objects back. Had to close the file and restart Rhino.

Someone else having a similar problem [image] RHINO 6 BUG , deletes all geometry, can't control-z to get it back Rhino for Windows Hi this is still an issue in rhino 8 SR21. Happened to me twice and I can’t find a way to get geometry back confused

That issue you linked is a totally different issue. The undo bug has to do with a command starting an undo record but never finishing it. The next time this happens, before closing Rhino pls run AuditUndo and TestCurrentUndo and post back the results. These might help us track down the source of the issue.

Undo fails

Serengeti (Rhino BETA)

martinsiegrist (Martin Siegrist) August 15, 2025, 6:04am 7

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Undo fails

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