I don’t seem to be alone either, many sites out there using Google Map API and map markers / popup info windows I have found have a bleed though of 1 pixel transparent or some places 1 pixel misaligned spacing.
The issue appeared in IE but not in Firefox (no please go away, do not even go there, I like IE, so please leave me on this).. I used IE’s (very nice) Developer Tools, but had no joy.
eg., a doctype.xml file named to coincide with the desired host skin name,
eg: "Horizontal Menu – Fixed Width.doctype.xml"
popped in alongside the DNN skin files itself, containing this:
<![CDATA[<?xml version="1.0" .. (etc) .. /TR/html4/loose.dtd">]]>
will make DNN display the alternate DTD from the XML file instead of the usual one.