A user (1c7) reported that clicking “Preferences” on their local Discourse instance resulted in a 404 error, despite no codebase changes. They shared screenshots showing the issue before and after clicking the link, and noted that even entering safe mode didn’t resolve it. Johani suggested disabling plugins via /safe-mode, but 1c7 found that entering safe mode redirected them to the homepage, and the 404 persisted. 1c7 offered remote access via TeamViewer for debugging, but Johani declined, noting they couldn’t diagnose further. 1c7 thanked them for their time. Eventually, 1c7 resolved the issue by cloning a fresh copy of the Discourse repo, running migrations, and starting the server — which restored the Preferences page. They suspect the original issue may have stemmed from a theme or plugin, and later noted that running Sidekiq locally also fixed the 404, suggesting it was part of the root cause. The problem is now resolved on their local Macbook Pro running localhost:3000.