version is 5.1.0-foe15a4
I am running linux mint

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System:    Kernel: 5.4.0-73-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 4.6.7
           wm: muffin dm: LightDM Distro: Linux Mint 20 Ulyana base: Ubuntu 20.04 focal
Machine:   Type: Desktop System: eMachines product: ET1831 v: N/A serial: <filter> Chassis:
           type: 3 serial: <filter>
           Mobo: eMachines model: EMCP73VT-PM serial: <filter> BIOS: AMI v: P01-A1
           date: 09/14/2009
CPU:       Topology: Dual Core model: Pentium E5400 bits: 64 type: MCP arch: Penryn rev: A
           L2 cache: 2048 KiB
           flags: lm nx pae sse sse2 sse3 ssse3 vmx bogomips: 10800
           Speed: 1580 MHz min/max: 1203/2700 MHz Core speeds (MHz): 1: 1419 2: 1383
Graphics:  Device-1: NVIDIA GT218 [GeForce 210] vendor: eVga.com. driver: nvidia v: 340.108
           bus ID: 02:00.0 chip ID: 10de:0a65
           Display: x11 server: X.Org 1.20.9 driver: nvidia
           unloaded: fbdev,modesetting,nouveau,vesa resolution: 1920x1200~60Hz
           OpenGL: renderer: GeForce 210/PCIe/SSE2 v: 3.3.0 NVIDIA 340.108 direct render: Yes
Audio:     Device-1: NVIDIA MCP73 High Definition Audio vendor: Acer Incorporated ALI
           driver: snd_hda_intel v: kernel bus ID: 00:09.0 chip ID: 10de:07fc
           Device-2: NVIDIA High Definition Audio vendor: eVga.com. driver: snd_hda_intel
           v: kernel bus ID: 02:00.1 chip ID: 10de:0be3
           Sound Server: ALSA v: k5.4.0-73-generic
Network:   Device-1: Realtek RTL810xE PCI Express Fast Ethernet vendor: Acer Incorporated ALI
           driver: r8169 v: kernel port: e800 bus ID: 04:00.0 chip ID: 10ec:8136
           IF: enp4s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:    Local Storage: total: 1.14 TiB used: 190.15 GiB (16.3%)
           ID-1: /dev/sda vendor: SanDisk model: SDSSDHP256G size: 238.47 GiB speed: 3.0 Gb/s
           serial: <filter>
           ID-2: /dev/sdb vendor: Western Digital model: WD10EZEX-60ZF5A0 size: 931.51 GiB
           speed: 3.0 Gb/s serial: <filter>
Partition: ID-1: / size: 233.24 GiB used: 117.26 GiB (50.3%) fs: ext4 dev: /dev/sda5
Sensors:   System Temperatures: cpu: 54.0 C mobo: N/A gpu: nvidia temp: 70 C
           Fan Speeds (RPM): N/A
Repos:     No active apt repos in: /etc/apt/sources.list
           Active apt repos in: /etc/apt/sources.list.d/google-chrome-beta.list
           1: deb [arch=amd64] http: //dl.google.com/linux/chrome/deb/ stable main
           Active apt repos in: /etc/apt/sources.list.d/nordvpn.list
           1: deb https: //repo.nordvpn.com/deb/nordvpn/debian stable main
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
           1: deb http: //packages.linuxmint.com ulyana 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
Info:      Processes: 246 Uptime: 8d 1h 49m Memory: 3.84 GiB used: 2.35 GiB (61.2%) Init: systemd
           v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Client: Unknown python3.8 client
           inxi: 3.0.38

I tried printing to a pdf and that dont work.
By dont work I mean nothing happens, the printer does not light up and the pdf will get written with no data. A blank page.

Any ideas or clues ?

Anybody ?
Could this be a KDE issue and if so, how do I prove or disprove it ?

thanks

Yes, it could be a more global problem. Prove/disprove it: do other KDE applications show the same behavior or not.

As a side note, the version you mentioned does not exist: the letter 'o' is not part of the hexadecimal system, so it must be a zero. This version is about 8 months old. Not sure if there were any fixes in the meantime around this area. You may try to use a recent AppImage version and see if that helps to fix it for you.

Well, I went back and installed the version from the software library and it works fine.
So, problem solved based upon a suggestion by ipwizard.