I just installed 2009 last night and today when I opened up the project that I was just working on yesterday in 2008, I no longer see the temporary dimensions when I click on walls.
I had heard that when a Revit model gets too "complex", you suddenly have to start hitting "Activate Dimensions" every time you select a wall, but my model did not change from last night to this morning.
My model is of only four single family homes...surely that's not too "complex" for Revit to deal with. Is this a bug in 2009?