Could be a driver issue. Check out your XF86Config (or XF86Config-4) file. It should be located in /etc/X11/. If not, do a search for it.
Anywho, open it up and look for these lines:
Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
# Option "Protocol" "Xqueue"
# Option "BaudRate" "9600"
# Option "SampleRate" "150"
# Option "Emulate3Buttons"
# Option "Emulate3Timeout" "50"
# Option "ChordMiddle"
EndSection
This is for my mouse, which has a scroll wheel. If you don't have a scroll wheel, then you'll want to change the device to /dev/mouse and the Protocol to PS/2. You'll also have to comment out the Option "ZAxisMapping 4 5" statement.
See if that works and or helps.
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