ANOMIA  This is unacceptable...

I'm on a iMac core 2 Duo 2.16mhz with 10.4.11, and I was running ver.3.0 which was acceptable.

THIS 3.1 version however, ground my machine to halt with spotty keyboard and mouse behaviour - and countless other app weirdnesses.

I know this control panel has a spotty history - fix it better than this, really it's sad you made it even worse!  
(Version 3.1)

JOSDANS  This control panel totally freaks out the mouse. I have to use it without any Logtiech control panel. It's a pitty because then you cant configure the different buttons.  
(Version 3.1)

MEGAMAN  3.1 screws my Tabs in Safari so I can't tell which tab I'm in.

COME ON LOGITECH!

What's it gonna take for this company to take writing software for its product seriously? I mean really. I've been using Logitech mice and keyboards for eons and cannot remember a time where their software wasn't getting canned by consumers.

All these years later and it's the same old story.

Says allot about how much Logitech listens to its customers.  
(Version 3.1)

FVDG  For some reason it screws up the way tabs are drawn in Safari, they all have the same grey color until you click on one, it is hard to see which tab it is you are viewing (I'm in 64 mode, kernel)  
(Version 3.1)

KERNELG  I had been using USB Overdrive with my Logitech MX1000 for years. My various experiences with LCC were very bad: It didn't recognize all the buttons on the mouse, it relied on haxies, it was not updated for serious bugs for long periods of time. But with the recent update for Snow Leopard, USB Overdrive (and Steermouse) does not support all of the buttons on several Logitech models. A fix is promised to come soon, and while I love USB Overdrive, promised features can take years to materialize, if they ever do. Some people are also saying that setup is even more convoluted than before (try adjusting tracking speed on 20 app profiles with 2 pop-up menus each). So in the mean time, I decided to give the free LCC 3.1 a try. I took some screenshots and notes of my USB Overdrive settings then used it's own uninstaller to remove it completely.

The LCC install went smoothly and after a restart, it recognized my MX1000 with no problems. I immediately notice that tracking is a little smoother. I also notice that vertical scrolling is extremely slow and/or high resolution. Better yet, tracking speed is a universal setting and not per-application. Scrolling, however, is per-app and even on the fastest setting is still slow for some. Tweetie, for example, scrolls slower on the full setting than USB Overdrive ever did. But I'm already getting used to this.

LCC's only other drawback is that there is no application profile overlap or punch through. I cannot, for example, make a profile for iTunes and reassign only the mouse thumb buttons perform keystrokes Command-[ and Command-] for back and forward, but use my global settings for everything else. In fact, I can't find a way to even copy my global settings into a new profile to at least have a common starting point. I tried using the "nothing" assignment in the pop-up menus for other buttons, but that just made them do, indeed, nothing. I'd love to know if I'm just missing the obvious here.

On the positive side, LCC 3.1 has fixed a few problems I was having with USB Overdrive and had mistakenly attributed to the mouse. The "back" thumb button was frequently registering two clicks when I'd hit it once. Tracking was very jerky in World of Warcraft when moving the camera quickly. Horizontal scrolling was more of a horizontal 10-pixel nudge, with no auto-repeat or acceleration. I couldn't assign anything to keys F16 through F19 because these were apparently new science. All of this is now history with LCC, and I'm loving that my aging MX1000, for which there is no modern equal, may still have a couple of years left in it.

I see that all is not well in comments here, and on Logitech's own forum. As I said above, I made sure to fully uninstall USB Overdrive before installing LCC, and I don't think I had any previous LCC preferences on this machine for the new version to pick up. I'm running a Mac Pro 3,1 (Early 2008) 8-core with OS X 10.6.1. There are no other input drivers running. LCC 3.1 is rocking here. For free!  
(Version 3.1)

JEDI  I have also a Problem with LCC 3.1 on a Mac Pro 3.1. After installing 3.1 over an existing 3.0 Version, my MX Revolution is not recognized anymore. I have deinstall and reinstall LCC 3.1 many Times with no success.  
(Version 3.1)

SUPERMAN S  I have no problem with this update   
(Version 3.1)

MRLEON  I have no idea why some people have problems with LCC, I've just installed in my Mac Pro 3,1 Snow Leopard 10.6.1, and everything works just fine!

Thanks Logitech!!  
(Version 3.1)

KSRHEE24  After installation, my main screen went blank or it was hard to see anything on the screen.

After a couple of reboots using power button, I got the main screen back, but then I didn't want to take chance that this will happen again.

I uninstalled LCC 3.1, and the problem hasn't happened for several reboots.

I'm staying away from this.  
(Version 3.1)

MANU_7312  This is possibly the worst of the worst... of the worst... EVER !!! I had 3.0 installed on my system (OSX SL), and everything was working fine (with the tweaks for the Expose issue mentioned below). Today I installed the 3.1 version and... my cordless optical trackman is not recognized anymore ("No Logitech Device Found")!!! I put LCC 3.0 back using Time Machine, and my trackman is recognized again... Is anybody else having the same issue with LCC 3.1 ?  
(Version 3.1)