Hold down middle mouse button and move the mouse.

rahvah

Are you using the Logitech Gaming Software? Do you have the "middle mouse button click" assigned to your middle mouse button or something else?

If you have assigned a gaming profile for GalCiv3 (within LGS) then make sure that the key assign setting is set in that profile. Also check your G-shift mode.

Configuring the G600 gaming mouse buttons

rahvah,

In the screenshot you show the mouse settings for the default profile. Does GalCiv3 run under this profile or does it have its own?

LGS sometimes gets confused and links the wrong executables to profiles, so you might have to check all of them. Point at a profile, click on the little down pointing arrow (in the lower right corner of the Profile icon), and select "Properties". Check if the GalCiv.exe is linked in only one profile. Check the mouse settings in the profile that handles the GalCiv.exe.

Sometimes background tasks can make LGS switch profiles, even while the game is running. If so tick the "Lock profile while game is running" in the profile properties.

Check if there is no script attached to the profile that you are using for GalCiv3. Point at a profile, click on the little down pointing arrow, and select "Scripting". A empty script should look like this:

function OnEvent(event, arg)
    --OutputLogMessage("event = %s, arg = %s\n", event, arg);
end

Furthermore make sure you do not have a profile that activates on the steam executable.

Piece of advise: If you don't have a separate profile for GalCiv3, make one.

Also, does the middle mouse button function in other programs?

Can't wait till they add in proper rotation controls.

Have you tried another, simpler mouse to make sure it is in fact your mouse that's the problem...?

I think this fixed the issue. Not in the way I was expecting though.

I plugged in a Microsoft wireless mouse I have for my laptop. At first, it didn't work. I was disappointed, but around 5 seconds of trying and voila (Yes, I waited for windows to install the driver before launching the game). After that I tried with my G600 again and it works... Weird as hell.

I am glad it works now. Thank you all for all your help.