Mouse disappear in VirtualBox

I am using latest version of VirtualBox (VirtualBox 4.3.6 for Windows hosts) and after installing any OS and clicking inside of it mouse disappear. It is not visible until I press right CRTL. Anyone know what can cause this problem. I have also installed extension pack.

Solution 1:

In my case, it worked by changing pointing device from 'PS/2 Mouse' to 'USB Tablet'.

While guest is not running, in VirtualBox
-> select the virtual-guest instance
-> click 'Settings'
-> select 'System' in left panel
-> go to 'Motherboard' tab and in pointing device, choose 'USB Tablet' instead of 'PS/2 Mouse'

Solution 2:

Somehow

Machine -> Disabling Mouse Integration

Then

Machine -> Disabling Mouse Integration 

(yes twice, once to turn it off, once to turn it on again) actually fixed it for me.

Solution 3:

Following steps worked for me.

1. Go to machine settings -> System -> Motherboard.
2. Select PS/2 mouse as a pointing device.