Persistent AO animation ?windows 64 bit problem

Hi - wondering if there are any Windows 64 bit users out there who can help. My friend runs SL on a Windows 64 bit system. After putting on an avatar which required her to be squished up with an ao, her avatar is now stuck in that animation. She has reattached the avatar and detached everything - even stopped all animations, flushed animations and dumped attachments in debug. The problem appears to be gone when she first logs into the game. But the minute she sits down, her avatar scrunches up again and remains scrunched up even when standing. When I logged on with her avatar, I was able to fix the problem by clearing my cache. I run windows xp. however when she logged on again, the problem recurred. her directory tree is not the same as xp hence clear cache did not work for her. she had to clear the files away manually. she has also uninstalled and reinstalled the game. Yet the problem persists.
Any further suggestions would be greatly appreciated. Thank you