I do not see any pictures, but you are right in saying you will need to modify the classic menu colours.  Some apps use ownerdrawn menus and these will use the classic menu fonts & colours.

A way of seeing this is to right click on a clear area of the desktop.  The initial menu uses the WB settings and the New submenu is ownerdrawn & uses the classic menu colours.

In general the classic menu colours & the menu colours set in the menus section should be similar to those used by the rest of the skin.  This is especially true for the menu selection classic colour & the menuitem bitmap.

Changing the classic colours is the only solution as it is being caused by those settings.

It looks like the pictures only show once you have manually visited those links (and only if you cut & paste the URL into the address bar).  I guess the site is checking where you are visiting from.