several xml/gui files have been edited for this release, if you are using any mods check the repro to see if there are updates http://planeshift3dmod.svn.sourceforge.net/viewvc/planeshift3dmod/Caarrie/data/gui/Off hand i know inventory.xml and petitiongm.xml got updated
I really hope that all the other pre-"0.4.03" inventory MODS got their head/helmet slot fixed!(mentioned it here: http://hydlaa.com/smf/index.php?topic=32335.msg394184#msg394184 )
Can't say it often enought
It appears to me that your mod does not yet contain the "ColorTool" widget in the "illumination.xml" file (which is used to display maps in-game).