Ubuntu 14.04 mouse and window focus issues
Solution 1:
So I kept looking around and the problem seems to have been the type of mouse I have. I found a thread on the Ubuntu forums by a user with a similar mouse having a problem that sounded like mine. In the thread it was suggested to (create and) edit the /etc/X11/xorg.conf files with the following:
Section "InputClass"
Identifier "Mouse Remap"
MatchProduct "Saitek Cyborg R.A.T.5 Mouse"
MatchDevicePath "/dev/input/event*"
Option "ButtonMapping" "1 2 3 4 5 6 7 2 9 10 11 12 0 0 0"
EndSection
And then I restarted my computer.
I have RAT5 gaming mouse and the use from the thread has the RAT7 gaming mouse. It has been a day since I implemented the fix and there have been no problems. Didn't bother looking into why it was buggy but I know the above configuration fixed it.
Thread: http://ubuntuforums.org/showthread.php?t=2152976
Solution 2:
A search for a similar problem brought me here. Left mouse click doesn't work anymore, neither on the mouse itself nor on touch pad. In my case it is a matter of a bluetooth mouse.
My solution was to remove the mouse from the list of paired bluetooth devices (Dash → Bluetooth), switch off the mouse and re-pair it after a reboot.
Solution 3:
I had this on 16.04 with a laptop and a USB mouse connected. USB mouse didn't work. Clicking once on the laptop's touchpad got the mouse's buttons to work again.
Solution 4:
I found a solution to similar focus problem. A part of it was that mouse focus remained locked to one window but keyboard focus was in another. I fixed it by running:
sudo apt install wmctrl
xfconf-query -c xfwm4 -p /general/click_to_focus -s true
wmctrl -R WindowName
xfconf-query -c xfwm4 -p /general/click_to_focus -s false
Here are the links to original answer and bug report.