Logitech Mouse Drivers are to blame. Over all I highly recommend people stop buying Logitech hardware. They don't care about mac. It's been that way for almost 8+ years. They have the worst Mac development team and drivers are always a problem. Oct 03, 2015 It took something like nine months for Logitech to release an updated driver for Yosemite. I decided I wasn't going to wait for them this time and I ended up buying Steermouse. I'm annoyed at Logitech for not providing proper OS X support and having to shell out the additional cost. I wouldn't recommend Logitech products for Mac users.

I'm not sure I understand why anyone would use the LCC.

Wayne,
Unfortunately Logitech's newest mice are not fully recognized by the available third-party mouse software such as SteerMouse or with USB OverDrive the functionality is limited.
Consequently those of us using the VX Nano or new Anywhere VX mice are sort of stuck with LCC. Even then LCC might be more tolerable if it provided all of the configuration options that the Windows version does.

so… i can modify the actions of the buttons on my Logitech mouse? Adjust the speed while in the air, so i can scroll with the touchpad and use Exposé with the scroll buttons? Just some examples.

I use a Logitech bluetooth mouse. I never installed the driver software. It works fine without it. When I upgraded from Leopard to Snow Leopard, I had to re-discover the mouse to make the connection automatic after a reboot.

LCC is also known with 3.2 to kernel panic macs that use diNovo keyboards.
Reason to use LCC: so you can use all of the extra features of your logitech keyboard.

I had so many issues with Logitech mouse software about 4 years ago that I will never, ever use it again. It trashed my machine and took me many hours and reboots to remove completely.
Drop $20 on USB Overdrive and you can customize your Logitech mouse to your heart's content. Yes it's annoying to spend $20 on USB drivers but it's worth it. I love Logitech mice but hate Logitech software & customer service. What else am I going to do?

I had so many issues with Logitech mouse software about 4 years ago that I will never, ever use it again. It trashed my machine and took me many hours and reboots to remove completely.
Drop $20 on USB Overdrive and you can customize your Logitech mouse to your heart's content. Yes it's annoying to spend $20 on USB drivers but it's worth it. I love Logitech mice but hate Logitech software & customer service. What else am I going to do?

I am still using 2.4 on my Snow Leopard machine, I only have a keyboard as I use a M$ Trackball Explorer on it.
I see no need to update as the current version works fine for what I want it to do.

My problem on LCC 3.2 was double characters when typing. Impossible to use. Went back to 3.1

Easiest fix: install USB Overdrive or SteerMouse.
LCC sucks. Don't waste your time with that junk.

I am all for using USB Overdrive in place of LCC. While the LCC interface and feature set is nice, it has proven to be extremely buggy over the years. And it's not the same old bugs. Each new version seems to introduce another one.
However, USB Overdrive is not free and I don't think that people who just shelled out hard-earned money for a fancy mouse should have to pay extra for drivers that work right.
Logitech should just license USB Overdrive and ship that as the Mac drivers for their mice, because LCC seems like it will never be 'fixed.' They've had years to get it right, and just can't do it.
An even better solution would be if Apple's Mouse prefpane in System Preferences would allow configuration of multi-button mice. Seriously, in 2010, that seems like something we should just expect from a modern OS. Now if you buy a Apple-branded mouse, the Mouse prefpane suddenly *does* get all the configuration options you could ever want. I guess giving us all those options with a $5 off-the-shelf USB mouse would cut into Apple's peripheral sales...

I think I'm glad I didn't update to 3.2 :)
3.1 works fine with me, I need it to make the tilt into a middle click since the middle click is much too stiff. I haven't had any issues with 3.1, though I did have some trouble with one of the 2.x versions with World of Warcraft.

You want a permanent fix? Get Steermouse. I have had nothing but varied luck with different versions of LCC going back years. Steermouse has always done me right AND has more ways to customize your buttons.

Logitech Mouse Drivers For Mac Yosemite Update

Well I have SL and LCC and have not had a single problem with it so far!
Yes, the interface is really chunky and I would rather have it integrated into the OS but...it works for me very well.
Has a lot of possibilities for every button too.
Oh, just one thing: Profiles don't work.

LCC 3.2 also has issues with ddoouubbllee cchhaarraacctteerrss, at least for some keyboards: not a trivial thing (it makes the keyboard practically unusable), so one could have expected that they released a 3.2.1 update as soon as possible.
Instead, nothing, zero, nada de nada, no update.
Not good for a Swiss company, which should value precision above all...
P.S.: ... And also still no renewed Mac OS X QuickCam software for their webcams.

I used the LCC back in the days of OSX 10.2 and 10.3 and also found it to be buggy and unreliable. New versions back then introduced new bugs and incompatibility with the latest OS releases. I was really glad when I realised I could remove LCC and just use the native drivers on 10.4 (ie extra mouse buttons for expose).
Sad to hear they still can't get it right.

Another vote for SteerMouse. IMHO, the Logitech mouse hardware is the best and conversely, the Logitech mouse software is the worst.
SteerMouse works flawlessly on all my macs, including a PowerBook, Macbook, MacBook Pro, Mac Mini (both intel and pre-intel) and a G5. I've used it for 3 different Logitech mice, a Microsoft bluetooth mouse, and even the Apple Magic Mouse.

I long stopped using Logitech drivers as i had so many problems on various client systems.
Real bummer as IT bought 50 Logitech mouses everyone installed the drivers themselves and the problems began.
I use USBOverdrive and it really has never failed me with loads of different devices.
http://www.usboverdrive.com/USBOverdrive/News.html

Logitech Mouse Driver Mac

Ya I had this issue with my logitech mouse, thanks :)

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Well, 3.2 finally fixed things for my VX Revolution. Before, I was unable to see the General Tab in the LCC. It would flash up and disappear. I had complained to Logitech for over a year.
And their support truly sucks. For example, it is impossible to use their support pages because there is no option to log in with an existing account!