Bug: I crashed wow with an animation

This crashes me on the PTR after 15 seconds.

<Ui
xmlns="http://www.blizzard.com/wow/ui/"
xmlns:xsi="http://www.w3.org/1801/XMLSchema-instance"
xsi:schemaLocation="http://www.blizzard.com/wow/ui/..\FrameXML\UI.xsd"
>
<Frame name="ThisCausesACrash" parent="UIParent" hidden="false">
<Size x="64" y="64"/>

<Anchors>
<Anchor point="CENTER"/>
</Anchors>

<Layers>
<Layer level="BACKGROUND">
<Texture name="$parentTexture" file="Interface\CharacterFrame\TemporaryPortrait-Male-Human" setAllPoints="true"/>
</Layer>
</Layers>

<Animations>
<AnimationGroup name="$parentSpinner" looping="NONE">
<Rotation name="$parentRotate" degrees="180" duration="15">
<Origin point="CENTER"/>
</Rotation>
</AnimationGroup>
</Animations>

<Scripts>
<OnLoad>
self:RegisterEvent('PLAYER_LOGIN')
</OnLoad>
<OnEvent>
_G[self:GetName() .. 'Spinner']:Play()
</OnEvent>
</Scripts>
</Frame>
</Ui>


If looping is set to "BOUNCE" or "REPEAT" then no crash occurs.

compy info:
Windows 7 Beta (Build 7000, 64 Bit)
Core 2 Quad (Q6600)
4GB DDR2
Geforce 8800 GT, Driver Version 182.06