I have occasionally noticed this in Node-RED v3 and above, usually a redeploy fixed it for me.
However that "[warn] Projects disabled : editorTheme.projects.enabled=false" is not an issue, it's simply telling you that the editor is not running in projects mode (multiple projects).
You might try navigating to .node-red/node_modules and running "npm update"
Also see thread Upgrading to version 3 on windows, Inject nodes disabled
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