Every now and then my upper left corner of the screen becomes "unclickable".
Imagine you draw a horizontal line and a vertical line at the middle of the screen and then basically the upper left quarter that is created by these lines becomes non-reacting to clicks.
If an application window is "below" that quarter (or on that quarter) of the screen, i can not click any buttons or other UI elements.
At the same time i can click UI elements which are outside of this quarter.
If i move the Application to the right or down into any other part of the screen i can click UI elements that i could not click before.
It seems to me as if some other invisible Window becomes stuck at that place and it happens to be quite accurately 1/4 of the screen.
So far i only know that a restart fixes this issue. (maybe logout is enough).
I also tried to type
which somehow restarts my WM but that also does not help
Anyone has a clue what i could do to get rid of this or at least find the root cause why this keeps happening every few weeks?
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sebastian@sebastian-VirtualBox ~ $ inxi -Fxz
System: Host: sebastian-VirtualBox Kernel: 3.13.0-37-generic i686 (32 bit gcc: 4.8.2)
Desktop: Xfce 4.12.2 (Gtk 2.24.23) Distro: Linux Mint 17.3 Rosa
Machine: System: innotek (portable) product: VirtualBox v: 1.2
Mobo: Oracle model: VirtualBox v: 1.2 Bios: innotek v: VirtualBox date: 12/01/2006
CPU: Single core Intel Core i7-6600U (-UP-) cache: 4096 KB
flags: (nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3) bmips: 5617 speed: 2808 MHz (max)
Graphics: Card: InnoTek Systemberatung VirtualBox Graphics Adapter bus-ID: 00:02.0
Display Server: X.Org 1.15.1 drivers: vboxvideo (unloaded: fbdev,vesa) Resolution: firstname.lastname@example.org
GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits)
GLX Version: 2.1 Mesa 10.1.3 Direct Rendering: Yes
Audio: Card Intel 82801AA AC'97 Audio Controller driver: snd_intel8x0 ports: d100 d200 bus-ID: 00:05.0
Sound: Advanced Linux Sound Architecture v: k3.13.0-37-generic
Network: Card: Intel 82540EM Gigabit Ethernet Controller
driver: e1000 v: 7.3.21-k8-NAPI port: d010 bus-ID: 00:03.0
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives: HDD Total Size: 43.8GB (47.5% used) ID-1: /dev/sda model: VBOX_HARDDISK size: 43.8GB
Partition: ID-1: / size: 39G used: 20G (54%) fs: ext4 dev: /dev/sda1
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: None detected - is lm-sensors installed and configured?
Info: Processes: 181 Uptime: 7 days Memory: 1140.5/6057.0MB Init: Upstart runlevel: 2 Gcc sys: 4.8.4
Client: Shell (bash 4.3.111) inxi: 2.2.28