Hover Effect - the effect of hovering the mouse over a line/bar/etc may not be visible unless a plot is resized. This is very browser and chart-specific. To see if it is resolved by resizing simply grab an edge of the chart and pull a small amount to resize the chart and then re-test if the hover effect is now working. In general this is not a problem if transitions are used, it seems to be linked directly to charts that have the animated transitions.
Treemaps - the sample locations in a treemap are area-based and the layout of the treemap depends on the size and dimensions of the chart, this means that the treemap may differ in layout between platforms and browsers.
Tag Clouds - the layout is dynamic and also depends on the size and dimensions of the chart, this means that the tag cloud may differ in layout between platforms and browsers.
Layout Charts - the order of layout varies and may differ between browsers and platforms.
3d Scatterplots - the superimposition/order of the points on the canvas differs by browser and platform. This affects both the stacking of points as well as the 3d overlays such as the ellipse in scatter3d2.
Plots Restricted From Resizing - plots that are restricted from resizing (have resizableX/resizableY set to FALSE) will be restricted when maximizing the plot using the expand button in the menu bar as well. For example if a plot is restricted from width resizing when you press the maximize button the plot will expand the height but the width will remain fixed. If both parameters are false the plot will not resize but may move to the top left corner. This is expected behavior.