A private window can provide a useful comparison when a website behaves strangely. It uses a separate temporary cookie session, but it does not make browsing anonymous.
- Save any unfinished work in the normal window. Note the page, the action that fails and the exact error message so you can repeat the same test.
- Open a private window in the same browser and visit the site directly. If the task requires your account, sign in using the site's normal process.
- Try the same action once. Record whether it works and whether the account or page differs from the original test.
- If it works privately, investigate that site's stored data or relevant browser settings. Check the browser's support guidance before removing data, since removal may sign you out.
Close the private windows afterward. Treat the result as a clue rather than a diagnosis, because private browsing settings can also affect website behavior.

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