Weird icon appears in title bar

[guyellis]

I recently did apt update+upgrade and since then a strange icon appears on title bars on both active and inactive windows:
See attachment:

wavy lines upper left corner.png (23.06 KiB) Viewed 660 times

[diam0ndkiller]

Hey there,
could you please send you system information? You can find it in "System Reports > System Information > Copy".
Also, please give us any errors these commands give:

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grep -i xfwm4 /var/log/syslog
grep -i xfwm4 /var/log/Xorg.0.log
dmesg | grep -i xfwm4

[guyellis]

I restarted the system and this weird icon disappeared ...

Here's the sysinfo:

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System:    Kernel: 5.4.0-172-generic x86_64 bits: 64 compiler: gcc v: 9.4.0 Desktop: Xfce 4.16.0 
           tk: Gtk 3.24.20 wm: xfwm4 dm: LightDM Distro: Linux Mint 20.3 Una 
           base: Ubuntu 20.04 focal 
Machine:   Type: Desktop System: Dell product: OptiPlex 790 v: 01 serial: <filter> Chassis: 
           type: 15 serial: <filter> 
           Mobo: Dell model: 0D28YY v: A01 serial: <filter> BIOS: Dell v: A22 date: 07/03/2018 
CPU:       Topology: Dual Core model: Intel Core i3-2120 bits: 64 type: MT MCP arch: Sandy Bridge 
           rev: 7 L2 cache: 3072 KiB 
           flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 26340 
           Speed: 3293 MHz min/max: 1600/3300 MHz Core speeds (MHz): 1: 3293 2: 3293 3: 3293 
           4: 3293 
Graphics:  Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics vendor: Dell 
           driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:0102 
           Display: x11 server: X.Org 1.20.13 driver: modesetting unloaded: fbdev,vesa 
           resolution: 1920x1080~60Hz, 1600x1000~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 2000 (SNB GT1) v: 3.3 Mesa 21.2.6 
           compat-v: 3.0 direct render: Yes 
Audio:     Device-1: Intel 6 Series/C200 Series Family High Definition Audio vendor: Dell 
           driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:1c20 
           Sound Server: ALSA v: k5.4.0-172-generic 
Network:   Device-1: Intel 82579LM Gigabit Network vendor: Dell driver: e1000e v: 3.2.6-k 
           port: 3080 bus ID: 00:19.0 chip ID: 8086:1502 
           IF: enp0s25 state: up speed: 100 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 6.03 TiB used: 2.00 TiB (33.1%) 
           ID-1: /dev/sda vendor: Corsair model: Force 3 SSD size: 111.79 GiB speed: 6.0 Gb/s 
           serial: <filter> 
           ID-2: /dev/sdb vendor: Samsung model: P3-512 size: 476.94 GiB speed: 3.0 Gb/s 
           serial: <filter> 
           ID-3: /dev/sdc type: USB vendor: Western Digital model: WD My Passport 2626 
           size: 1.82 TiB serial: <filter> 
           ID-4: /dev/sdd type: USB vendor: Western Digital model: WD My Passport 2626 
           size: 1.82 TiB serial: <filter> 
           ID-5: /dev/sde type: USB vendor: Western Digital model: WD My Passport 2626 
           size: 1.82 TiB serial: <filter> 
Partition: ID-1: / size: 109.47 GiB used: 78.37 GiB (71.6%) fs: ext4 dev: /dev/sda1 
USB:       Hub: 1-0:1 info: Full speed (or root) Hub ports: 3 rev: 2.0 chip ID: 1d6b:0002 
           Hub: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0 
           chip ID: 8087:0024 
           Device-1: 1-1.3:4 info: Western Digital type: Mass Storage driver: usb-storage rev: 2.1 
           chip ID: 1058:2626 
           Hub: 2-0:1 info: Full speed (or root) Hub ports: 3 rev: 2.0 chip ID: 1d6b:0002 
           Hub: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 8 rev: 2.0 
           chip ID: 8087:0024 
           Device-2: 2-1.6:3 info: Logitech type: Mouse,HID driver: hid-generic,usbhid rev: 2.0 
           chip ID: 046d:c08e 
           Device-3: 2-1.7:5 info: Western Digital type: Mass Storage driver: usb-storage rev: 2.1 
           chip ID: 1058:2626 
           Device-4: 2-1.8:6 info: Western Digital type: Mass Storage driver: usb-storage rev: 2.1 
           chip ID: 1058:2626 
Sensors:   System Temperatures: cpu: 48.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Repos:     No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/inkscape_dev-stable-focal.list 
           1: deb http: //ppa.launchpad.net/inkscape.dev/stable/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http: //packages.linuxmint.com una main upstream import backport #id:linuxmint_main
           2: deb http: //archive.ubuntu.com/ubuntu focal main restricted universe multiverse
           3: deb http: //archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
           4: deb http: //archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
           5: deb http: //security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
           6: deb http: //archive.canonical.com/ubuntu/ focal partner
           Active apt repos in: /etc/apt/sources.list.d/shutter-ppa-focal.list 
           1: deb http: //ppa.launchpad.net/shutter/ppa/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/wfg-0ad-focal.list 
           1: deb http: //ppa.launchpad.net/wfg/0ad/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/winehq-focal.sources 
           1: deb [arch=amd64 i386] https: //dl.winehq.org/wine-builds/ubuntu focal main
Info:      Processes: 222 Uptime: 13h 02m Memory: 11.57 GiB used: 1.74 GiB (15.0%) Init: systemd 
           v: 245 runlevel: 5 Compilers: gcc: 9.4.0 alt: 9 Client: Unknown python3.8 client 
           inxi: 3.0.38 

[diam0ndkiller]

Hey,
cool to hear it works again. Maybe just run an upgrade (in the Update Manager or run

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sudo apt update && sudo apt upgrade

in a terminal).
If it happens again, you could also look for for maybe overloaded RAM. Or just tell us again.