So it seems that ScriptUI Panels don’t receive layout events, under the 64-bit Windows version of CS5.5. A forum post I ran across has a few other people with this issue, and they report it affects After Effects, and Photoshop also. I was able to work around it a little, by calling the PanelObject.layout.layout() function. Unfortunately, it doesn’t help with resize events, but it’s better than manually typing in coordinates for controls.
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