Flash plugin created not working in flash player 10.1 (release - not beta)

Question

Hello, i wrote a plugin using flash (you can click on the preview button to see it):
http://activeden.net/item/shiny-plugin/94112
It worked perfectly on all the previous flash player versions and in the new flash player 10.1 you can see the effect.
Actionscript wise -  it draws lines at various angles and then apply gradient glow on them.
If you re-install the previous version the plugin works again. any clue why is it happing? Thanks.
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System: Windows 7-64Bit
Flash player: 10.1
CPU: Intel Core 2 Quad 2.4MHz,3GB RAM
GPU: Nvidia 8800 GTS
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Answer 1

Thanks for the quick response! here is the file list (all file versions are 10.1.53.64):
C:\Windows\SysWOW64\Macromed\Flash:
Flash10h.ocx
FlashAuthor.cfg
FlashInstall.log
flashplayer.xpt
FlashUtil10h_ActiveX.dll
FlashUtil10h_ActiveX.exe
install.log
NPSWF32.dll
NPSWF32_FlashUtil.exe
uninstall_plugin.exe
C:\Windows\SysWOW64\Macromed\Flash\FlashPlayerTrust:
Adobe Search For Help.cfg
AdobeFireworksCS5.cfg
AdobeXMPFileInfo.cfg
AdobeXMPFileInfoCS5.cfg
kuler.cfg
ServiceManager.cfg
I also made sure all the addson are enabled. Still doesn't work.
disabled hardware acceleration.Still doesn't work.
the last resort is will try to update the GPU driver - as ʇɐb ɹəuəllıʍ said.
I will keep you posted either way. thanks