Hi there!

What I've bought:

I've the new Steelseries Sensei mouse,
and I am really glad for it, but it seems like I've an issue
because of the fact, that the movement of my mouse is not the same as my old one, even how much I try to predict the settings of my new mouse, it won't get even close to my old mouse(Microsoft Optical Wheel Mouse).

The Issue:

The thing is, whenever I am playing a game where you actually can sense the motion of your sensitivity of your mouse I get these weird "lifts" on my aim. It's like something is pushing my aim up every time I aim around, my aim slowly goes up(really slow), and when that happens it seems like it's hard aiming downwards. Let's say in a situation like in Counter-Strike 1.6 ;( I'm aiming on a person above me on a train, which I've just killed, and suddenly someone jumps towards me from the sideway "under the train", whenever i try to aim on that person/player it seems like its harder to aim down on him). Briefed said:It's basically harder for me to aim downwards than upwards (in some cases) and it happens most of the time, not all the time!

Things that I've tried:

*Re-installing SteelSeries Driver for the mouse(SteelSeries Engine)
*Re-plugging my mouse
*Try putting all the weird settings on, and then switch profile to my "real one" where everything is equalized to zero.
*Playing with the Polling Rate(hertz) from 125-250-500-100, none of those made difference for the exact issue that I HAVE.
*As you can see on the picture that's added above, I do NOT have any of those settings ON for them to trigger anything.
*When I plug in my old mouse, everything is all fine - Nothing is weird.
*My mouse(both) does not move by it-self at anytime..

The thing is, the first day I bought my SteelSeries Sensei I had to fix all these options to zero, when I did that, it seemed to work just fine until the next day - Suddenly this weird issue came with lifting the aim slowly.

If anyone has the same issue please let me know!

Forgot to link the picture of my SS Engine Profile:
http://www10.speedyshare.com/files/30456105/download/My%20SS%20Engine%20Profile.bmp

I have the Sensei too and its not not without its quirks which is to be expected considering they just released it.
I havent had this problem but I've got these.

My issues:

Upon reboot or start up the mouse resets to defaults until i click on the ss engine tray icon then my setting take effect.

I get terribad negative acceleration at high dpi/cpi when doing extremely fast flicks despite the surface qck, destructor,ironclad,goliathus,desk.

I cant choose any light shades of color as it all ends up the same pale pink-orange.

One the plus side it had the best lowest lift distance I've have ever experienced in a mouse.
Tracking is flawless at lower dpi\cpi
The new metallic surface is more comfortable IMO than the Xai.

Side note: It really annoys me I cant remove the preset profiles from the ss engine. Especially considering they all have the same settings anyway.

I bought SENSEI yesterday, i found my self with this same issue... i use Microsoft IE 3.0 and it works perfectly...

I've tried everything u said above and i can't find a fix for this...

If anyone knows how to fix this.. reply plz.

I use the IE 3.0 on a S&S and I get the same issue but what I have found is that it's not part of the hardware either
A. Mousepad is dirty
B. Optical is catching something (Normally Hair)
Just a quick clean and blow should do the trick but this is normally the reason now if there is a problem with the hardware then it would be on the lines of the Mouse reading faster than the PC can process which does happen but is far less likely to happen.

I hope this could be of Help.

I still have the problem that Louzzy is talking about..and idk what to do :-s

Yeah i got the same problem hope someone can help