I think I may have found the problem, or a problem.
The right pane only contains one item, OW_AQP_QUEST_INFO_LAYOUT.
Code:
<VerticalLayoutBox item="OW_AQP_RightPane">
<ScreenID>OW_AQP_RightPane</ScreenID>
<RelativePosition>true</RelativePosition>
<MinVSize>80</MinVSize>
<MinHSize>250</MinHSize>
<Style_Transparent>true</Style_Transparent>
<DrawTemplate>WDT_Inner</DrawTemplate>
<Style_Border>true</Style_Border>
<Style_Sizable>true</Style_Sizable>
<Spacing>10</Spacing>
<Pieces>Screen:OW_AQP_QuestInfoLayout</Pieces>
</VerticalLayoutBox>
But that element doesn't actually show any elements, so maybe hardcoded ?
Code:
<Screen item="OW_AQP_QuestInfoLayout">
<ScreenID>OW_AQP_QuestInfoLayout</ScreenID>
<RelativePosition>true</RelativePosition>
<MinVSize>450</MinVSize>
</Screen>