Today, I logon and find that; these mouse actions do not seem to be registering: Left Click, MouseWheelUp & MouseWheelDown. Yesterday, I did change my game settings, however after several hours of gameplay I did not encounter any issues after these changes were made. I am not experiencing these problems in other games. I have tried verifying the game files, restarting Steam and rebooting. I can use the mouse to navigate through the Menu and use Enter to access the Menus contents. When accessing the keybinds setup, I found the only mouse clicks I could use to change an action were: Right Click, Mouse 3, Mouse 4, Mouse 5. I have no idea what I could've done to cause this issue or more importantly how to fix it. Edit: Deleted all the ini files in directory \My Games\UnrealEngine3\HostileGame\Config and now it seems to be working.