2

On Virtualbox running Ubuntu I've encountered several times bug where suddenly top left quarter of the desktop becomes unresponsive to mouse clicks, what is causing this and how could I fix this?

3

This problem seems to be related to VBoxClient process being stuck, simply looking this from process list and ending the process seems to work as a fix.

For me killing instances ran with --draganddrop parameter restored the functionality of that area.

You can open terminal using keyboard combination of ctrl+alt+t, and type:

ps aux www | grep VBoxClient --

to look for the process ID (PID) then kill it with

kill -9 PID

Alternatively pkill VBoxClient might do the trick.

After this to restore drag and drop support you can run

VBoxClient-all

For reference here is xwininfo of the un-clickable area:

  xwininfo: Window id: 0x1200001 "VBoxClientWndDnD"

  Absolute upper-left X:  0
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 800
  Height: 600
  Depth: 0
  Visual: 0x21
  Visual Class: TrueColor
  Border width: 0
  Class: InputOnly
  Colormap: 0x0 (not installed)
  Bit Gravity State: ForgetGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: yes
  Corners:  +0+0  -1120+0  -1120-375  +0-375
  -geometry 800x600+0+0

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