Poikilos

Maybe make a backup using the settings backup extension if you do a lot of customizing. But in general, you should probably avoid manually changing files around. People will probably not be able to help since you've renamed files. The only suggestion I'd have is to rename them back. :edit: But you say you've already reverted the files. That doesn't seem possible to not fix it if you reverted both the names and the content to prior working versions. Make sure the program is closed when you revert files.

I had a similar problem with 5.4.0. Materials and printers are there but the first-time setup makes me add a printer anyway so I thought they were lost until I looked closer (Preferences, Configure cura, Printers had all of my old printers and duplicate printers I was adding when Cura asked by force). Solutions are discussed at the topics below:

I had the problem and it went away by itself, but I needed to change something (add a material) to trigger settings to save for some reason after upgrading to 5.4.0. I mentioned that on a similar topic: Note that always save my own material and print profiles too, as noted by ahoeben:

I got the release notes screen no matter what I did on 5.3...every time for months! It was the same but worse on 5.4.0 at first, where I'd also get the first time setup wizard to add a printer...Even though my printer profiles were there after adding a new generic printer, I had to add another new printer every time and they kept adding up unless I deleted them... Solution which worked for me: Only the first few starts had the problem in 5.4.0. Then I fiddled with some settings (added a material profile, made a backup) and eventually triggered Cura to save somehow. Now when I start the program, everything is behaving: I neither get the new version screen nor the first-time setup wizard, and all of my printers and material profiles are there (in my case they never left). I deleted the new duplicate printers with no problems. After all that, I made a backup of the settings again using the settings backup extension. Checking file permissions may help. I did the following (but it didn't seem to be necessary nor fix it for me): chown -r $USER ~/.config/cura chown -r $USER ~/.local/share/cura I don't recommend the Flatpak version because flatpak programs save settings somewhere deep in ~/.local/share/flatpak/app/. Settings for AppImage programs will save in standard locations such as used in the commands above. If you want a one-like command to install an AppImage & application menu icon, you can use my nopackage program on GitHub (If you have trouble with that, ask on the Issues page there). In some cases your materials may not show up because you have a different diameter set on your printer settings. That happened to me. I don't know how it got set wrong, but when I set the filament diameter back to 1.75 mm in the active printer profile, all of the materials (builtin generic ones and my custom ones) reappeared.

@GregValiant The program uses mm/s and G-code uses mm/minute, as the original post mentioned. It is an issue in which Cura doesn't support a standard. I've added it as a new issue: https://github.com/Ultimaker/Cura/issues/10636

You may have to edit the files manually as described at the following URL. It may work for you since it is the same error but with a different quality type: https://github.com/Ultimaker/Cura/issues/6453#issuecomment-790267742 Ultimaker, please fix this. It is still happening in 4.8.0. More details are at the URL.