I often run actions that have modal control for certain steps turned on, in particular, when I want to give a layer a custom name. Prior to CS6, I'd run my action, the window would open allowing me to rename my layer, and then it finishes my action. However, in CS6, it seems to ignore the modal control button selected, puts in whatever the default info is and continues on. This hoses quite a few of my actions that I've been using for years. Submit a bug report?
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Jeff just record an action one step where you double click on the current layer name in the layers palette and changes its name. Stop recording. Turn on the steps dialog in this one step action. Run it in Prior version of Photoshop you will be presented with the rename dialog with the recorded name filled in. You will be able to interactivity change that name. With CS6 will rename the layer without giving you the rename dialog.