If the page just spins or throws a 504 error, the issue is usually on the server side — but before assuming that, clear your browser cache and try a different browser. Chrome and Firefox tend to behave differently with the site's older frontend. If neither works, check your DNS settings: switching to 8.8.8.8 sometimes resolves intermittent connectivity issues with the platform.
This one is frustratingly common. The login system occasionally breaks after password resets or when cookies are stale. Clear all site cookies specifically for thingiverse.com, then try logging in again. If you use a Google or social login, disconnect and reconnect the account through your profile settings. Sometimes the session just gets stuck and needs a full logout from all devices.
The search index on Thingiverse is notoriously inconsistent. If a search for a common term like 'phone stand' returns nothing or wildly unrelated things, try using simpler keywords or browse by category instead. Sorting by 'Newest' sometimes breaks the results entirely — switch to 'Relevance' and reload. Bookmarking direct category URLs is a practical workaround for repeated searches.
After uploading an STL or project, it can take anywhere from a few minutes to a couple of hours to show up publicly. If it's been over two hours, check the 'My Designs' section directly — the file might be stuck in draft mode or flagged during processing. Re-uploading a slightly renamed file usually kicks the system into processing it correctly.