If you are seeing page elements bleeding through the lightbox effect of an intromercial, there may be a problem with z-index values.
Z-index is a CSS property that sets the stack order of specific elements. An element with greater stack order is always in front of another element with lower stack order.
The z-index value of the intromercial (which is 2147483440) should be higher than the z-index value of the webpage or any of its elements.
If the intromercial has the highest z-index value of all elements but you are still seeing a problem, please contact Support.