Rotate Your Mousepads!

You are all patricians, but I'm still seeing so many MLT04s on horizontally laid-out QCKs. There is conclusive evidence that the MLT04 sensor operates better on vertical QCKs: http://www.overclock.net/t/1561041/reverse-en...t_24477902

As you can see from the bottom pair of graphs, the malfunction behaviour on vertical QCK is more desirable than on horizontal. On the former it just stops tracking altogether; on the latter it reports negative counts (throwing your aim to the other side or up/down).

If you use an OMB, IME3.0, WMO or IMO on QCK, turn the mousepad to portrait orientation rather than landscape. For all other mousepads, you can use MouseTester to check which orientation if any produces the same, clean malfunction behaviour (on my Goliathus it's the same: good in portrait, bad in landscape).