Undo and Redo not working

[David Cockey]

The Undo and Redo icons are never active for me. I'm using PhotoScan Standard Version 0.9.0 build 1586 (64 bit) with Windows 7.

[Alexey Pasumansky]

Hello David,

Undo/Redo buttons only work for severl types of operations: points/faces removal, close holes operation.
Such procedures as mesh decimation, for example, could not be undone.