I’ve just recently upgraded to Unity 4.3, and ran in to a pretty big bug. The “Undo” and “Redo” functions in the editor no longer work, all they do is change the inspector selection, but any values that were changed don’t revert to their previous states.
Been having similiar issues with the Undo, no matter what I change in the inspector the Undo option in the Edit menu remains greyed out.
Please use the bug reporter to report a bug with steps to reproduce and preferably attach the project.
Thanks
Steen