01028: PmWiki.GroupHeader should not define background color inline
Description: The PmWiki.GroupHeader defines a background color for the markup that is injected as a "style" attribute in the trail's enclosing "vspace" class paragraph.
If this color conflicts with your Wiki's skin, it seems that the only way to fix this is to define a different background color for all "vspace" as "!important".
This is not an ideal solution, I think the background color should be defined in the stylesheet, so it is more easily configurable.
The same problem seems to affect the markup.