Hey guys,
Recently picked up a WMO 1.1a (refurbished) as my Mamba from 09 passed :( Thought it was about time to go optical. Regardinf the WMO, as far as I can tell it's genuine; I've uploaded pics of the mouse as well as tests/drivers etc just in case it's not the real deal..

Basically everything has been going fine for the last few days, overclocked it at both 500hz & 1000hz with no issues. I noticed 1khz was only giving me 680-710hz so went back to 500hz.

But today I was testing out some sensitivities in csgo and ran the accel test from one side of my QCK+ to the other, making sure I was completely straight. When I moved to the right, the cursor sloped upwards at a perfect rate. Swiping back to the left (starting point) it sloped back down to the spot.

Outside of windows, moved the cursor to the left of the screen to monitor the mouse on the edge and sure enough the cursor traveled down the side of the monitor, the faster I went, the further it traveled downwards.

Tried this again at default rate and the effect was less prominent. In another usb 2.0 port, initially it was fine, but the more I swiped left/right the more this effect started to occur again..

Not sure if it's a hardware issue or if it's software related, just thought I'd see if you guys might of experienced this or know the cause before I buy another mouse (will probably get the ie3.0 anyways because this mouse is too flat for me but unbelievably responsive- when it was tracking properly).

Thanks for your time guys have a good one!

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Regarding PC:
Windows 7 x64. 6/11 windows sens. Ehp off. Markc mouse fix. QCT+ mat. Gigabyte x58a ud3r mobo. Oc i7 920 cpu. Previous razer software & drivers uninstalled.

--Anything else let me know!