Corrupt undo buffer

While I'm panning my fractal and my mouse button is acting up, I have to repeatedly undo/redo. Just now and for the first time I got a corrupted undo entry, which upon selecting gives a parameter error.

Since this is a curiosity, is there a way to inspect the raw data of the undo buffer? Is it stored in temp files or just in-memory?

It is stored in memory. I would be very interested if you have a way to reproduce this error.

I found a way to reproduce it. When mouse-drag-zooming but releasing without actually zooming, sometimes a new undo level is added, sometimes not. In the case it's not added, press undo and a ghost undo level appears.

Why isn't the video appearing that I attached!? It even complained when it was over 1 MB. Now it's 800 KB.

In the video the Default parameter is opened. I double-click once to arm the bug. Then I start drag-zooming and release without actually zooming. Then I invoke Undo via the menu (but Ctrl+Z works the same). Then I click on the ghost undo entry.

Thanks Mark, I will try to reproduce it.