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See the Troubleshoot an error page, look for the section on "DSpace 7.x".  This will provide you hints on locating error messages both in the User Interface (frontend) and in the REST API (backend)

User Interface starts to load but then spins (never fully loads)

Chances are your User Interface (UI) is throwing an error or receiving an unexpected response from the REST API backend.  Since the UI is Javascript based, it runs entirely in your browser.  That means the error it's hitting is most easily viewed in your browser (and in fact the error may never appear in log files).  

See the Troubleshoot an error page, look for the section on "DSpace 7.x".  It has a guide for locating UI error messages in your browser's Developer Tools.

"No _links section found at..." error from User Interface

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