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Okay, I have had a look and it appears that the permission error is on a node within the guts of the scrollview-scrollbar.js script. The node seems to be the '.yui3-scrollview-scrollbar-horiz' node. The actual issue seems to be with accessing the 'opacity' property on the node. What is odd is that this seems to be acceptable on the vertical scrollbar node, but not on the horizontal node.

The return stack is as follows:

dom-style-ie.js: 719 ComputedStyle.get()
combo: Transition.addProperty()
combo: Transition.initAttrs()
combo: Transition.run()
combo: Y.Node.transition() // Note: this is the transition for the horizontal scroll bar node.
combo: Y.Plugin.ScrollViewScrollbars._show()
combo: Y.Plugin.ScrollViewScrollbars.show()
combo: Y.Plugin.ScrollViewScrollbars._update()
combo: Y.Plugin.ScrollViewScrollbars._hostDimensionsChange() // After host method event
combo: Y.Plugin.ScrollViewScrollbars._uiDimensionsChange()
combo: Y.Widget.syncUI()
combo: Y.Widget.renderer()
combo: Y.Widget._defRenderFn()
combo: Y.ScrollView.render()

I can reproduce this consistently of the aforementioned site. Here is a screenshot from within the debugger:

I have worked around the issue on the live site but you can repro the issue here:

http://www.ccmexpertise.co.uk/broken.html