Yes, this patch has broken my extra mouse buttons as well. I am currently using the Corsair M95 Mouse and use the Corsair software to configure some of the buttons for keyboard press items.

I use a keyboard shortcut for mount/unmount, using my hotbar keybind of the "`" key, mapped to one of my keys and another button that toggles the built-in keybind of "R" mapped to another key on the mouse.

This is a game issue. This is not a mouse or mouse software issue. I can use the exact same keys within notepad, or any other program on the computer, and they will depress the keys they are mapped to depress. The game is blocking the use of those mouse buttons to use those keyboard functions.

Mouse software already removed, new download of software, re-installed, reconfigured..no change in functionality at all. What gives SE? Why are the buttons not working for gaming mice, or at least some gaming mice?