In this case, I am running a system with an Intel chip with 4 cores. By default the program is incorrectly naming the first core, Core 0 as Core 3. It does not activate (show) core 4 since it has also automatically labeled it correctly as Core 3. This can be changed via Properties, but it is reset back to incorrect settings after a logoff and back on. The sensors plugin version is 1.3.0 in panel 4.12.2 running OpenSUSE 15.1.
You have an old config file. Remove the plugin from the panel, quit via "xfce4-panel -q", remove all sensors-plugin files from ~/.config/local/xfce4/panel-plugins/ or similar, and then readd the plugin on the newly opened panel. Apart from that, please try version 1.3.92. Does the problem still persist after the above hints?
I'm having this problem as well. I'm using the stock version (1.3.0-2build1~18.04) available through Linux Mint 19.3. The advice given by Fabian did not resolve the issue for me. I attempted to test 1.3.92, but I couldn't get it to compile.
I have this issue as well since upgrading from 1.2.6 to 1.3.0. I prefer to not install software that doesn't come through my package manager so if there's a bugfix coming I'd rather wait until that's in the Ubuntu apt repo.
I agree with Gerret, I also tried Fabian's fix with the same result at Argyle. I am now running Opensuse 15.2 Beta in which the problem still exist. I have to other Arch machines running 1.3.92 which of course are fixed. Seems like a patch could be provided for the older 1.3.xx modules.
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