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I believe this is thread you're after:
https://www.steelsoldiers.com/threads/four-pin-plug-in-to-11-pin-plug-pic.69398/
Where is the page that houses that url so I can correct it?
Sounds like a cookie issue. Your account seems to be fine. Unless it's a very very old post that perhaps contains links to some of the older/lost sections of the site. Do you have a link to an example that fails? Or have you tried deleting your browser cookies and logging back into the site...