AutoCAD 2010 :: Removing Annotative Scale For Single Item?

I seem to have lost the ability to add or remove an annotative scale for a single item (piece of text, block etc).  I've always picked the annotative scale in the properties box and then hit the box at the right which brought up a small dialogue box where I could add or remove scales for the item that I'd highlighted.  When I hit that box now, or the similar box in the right click menu nothing happens.  AutoCAD acts like the box is present, but it isn't.  The right click option of remove current scale doesn't work either as it seems to remove the scale from multiple items.

I have recently gone from two monitors to one (it's a real bummer).  Is it possible that the dialogue box is open somewhere I can't find it?  I have hit the show desktop button and it isn't there.