iMon HW + Games => freezes time2time

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Hello.
I bought an chieftec HM-01 Case. There is an iMon Module included. It's an Vdf Module
But anyway...
Now i realized the following problem. PC Games like Pro Evolution Soccer 10 and FiFa 10 are not playable, when the USB-Connector of the iMon-Module is connected to the mainboard: The game freezes for about 1 second and contuinues a few seconds..then it freezes again...and so on..

I localized the problem as said above in the USB-Connection iMon Module <=> Mainboard. When this connection is not established the games work just fine. No stuttering anymore.

I tried the following to fix the problem:
-> Fresh install of Windows 7 x64 Prof. (1st try => no drivers installed; 2nd => all drivers installed [also newest iMon software])
-> Fresh install on Windows XP x32 Prof.
-> connected the Module on an internal and on an external USB-port)

The problem is still there. It's even there if no Imon Software is installed at all... Is there maybe an firmware update to fix that problem??

Plz help me!

My System:
Mainboard: Asus P7P55D PRO
CPU: intel Core i5-750 (2,66 Ghz)
Graphics: ATI Radeon 5750

and for a try i installed an nvidia Geforce GT 220 => same problem like above

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I found something in the FAQ:

http://www.soundgraph.com/forums/faq.php?faq=sg_faq_sw_imon_manager_g_01#faq_sg_faq _software_products_gamecontrol

I'll stesstest this later....But a quick test seemed to NOT fix the problem.. :(

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okay.... the result of the tests: there is no satisfying result. It's still stuttering when i try to play FiFa Soccer 10 or Pro Evolution Soccer 10. Even Adobe Premiere Pro seems to mess up with the iMon VFD-Device, when it's connected.

Anybody any suggestions?