it happened to me some while back too
after rather intense tests (lol), it seems to be happening when you have the reference editor window open at the same time.
don't ask me why, but as soon as I closed that window, my issue was solved.
In maya I have to hit undo at least twice to undo. I've probably got a special setting enabled somewhere, anyone know what it might be?
I've had this happen on several occasions for different reasons. In NEX sometimes I'll have to hit undo twice when selecting objects or undo-ing edges I've made by accident, once for NEX and once for Maya. It'll also happen in hypershade sometimes when I connect a file texture. I'll have to hit undo for every node it links from the 2DPlacement node to the file texture itself... :poly127:
Also, like greuh mentioned, sometimes with the attribute editor open. I guess this is it undoing both the change Maya made in your scene to reflect any new values you typed in, and your actual typing in and changing the value in the form.
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after rather intense tests (lol), it seems to be happening when you have the reference editor window open at the same time.
don't ask me why, but as soon as I closed that window, my issue was solved.
*sigh*
I've had this happen on several occasions for different reasons. In NEX sometimes I'll have to hit undo twice when selecting objects or undo-ing edges I've made by accident, once for NEX and once for Maya. It'll also happen in hypershade sometimes when I connect a file texture. I'll have to hit undo for every node it links from the 2DPlacement node to the file texture itself... :poly127:
Also, like greuh mentioned, sometimes with the attribute editor open. I guess this is it undoing both the change Maya made in your scene to reflect any new values you typed in, and your actual typing in and changing the value in the form.