Rounded corners - different in CS4

Question

Hello,
In CS3, to create a square or rectangle with only some of the corners rounded, I would do the following:
1. Create a square/rectangle
2. Apply the Effect > Stylise > Rounded Corners effect to it
3. Create a new square, and align it to the corner I wanted to be square
4. In Pathfinder, do Add to shape area
When I do the same in CS4, the rounded corners on the first shape disappear when I do "Add to shape area" in Pathfinder.
Does anybody know of any reason why this would not work in CS4?
I've attached 2 screenshots below that show the results in CS3 and CS4.
Thanks for any help.

Answer 1

Pathfinder Shape Modes can be applied either as an Effect or as an ordinary uniion of the paths. In versions prior to CS4, the default for those buttons applied an Effect, which you would then Expand to "nail down" as an ordianry path operation. You could optionally AltClick the Shape Mode Pathfinders to cause them to be applied as ordinary path operations.
In CS4, the default/optional behaviors were swapped. Now the default is to apply a normal path operation, and AltClicking applies it as Shape Mode Effect.
CS3 will yield the same result as you are getting in CS4 if you AltClick the Shape Mode Pathfinder instead of just clicking it. So inversely, I would expect that in CS4, you can get the same result as in CS3 if you AltClick the Shape Mode.
Related, the Filters menu was removed in CS4, so I assume Round Corners is only applied as an Effect which has to be Expanded to make it an ordinary path.
JET