Looking at your full XML file, I can see there are two </Element> missing.
One is for "LevelMeter" and the other is for "LevelMeterFill".
I am not sure if that is causing the problem or not.
One needs to go after the "LevelMeter_BonusMeter" element, the other after the "LevelMeterText" element.
Sample from Frosty's toolbar:
Code:
<Element ID="ToolbarFieldMain" X="0" Y="0" Width="1" Height="1"></Element>
<Element ID="LevelMeter" X="0" Y="0" Width="420" Height="30">
<Element ID="LevelMeterFill" X="5" Y="12" Width="420" Height="6">
<Element ID="LevelMeter_BonusMeter" X="0" Y="0" Width="420" Height="6"></Element>
</Element>
<Element ID="ToolbarButton_LevelUpXP_TutorialHighlight" X="0" Y="10" Width="420" Height="10"></Element>
<Element ID="ToolbarButton_Experience_TutorialHighlight" X="0" Y="10" Width="420" Height="10"></Element>
<Element ID="LevelMeterText" X="3" Y="10" Width="420" Height="10"></Element>
</Element>
Also found that the closing /Panel had an error. Here is a new XML for you to try...