Hi @David Lund ,
Initial guesses might be that it's because of using Parallels on an iMac.
It seems this is not a common issue. However, we can work together to narrow down and resolve the situation. So, Please kindly provide more information below to let us work further.
1.Are other users with permissions facing the same problem? View through another computer (No iMac)or account.
2.You could try to clear browser cache then restart it.
3.Try to use a different browser or your browser's InPrivate mode to see if the same error occurs.
4.Whether all SharePoint lists have the same problem? You could create a new SharePoint list to check.
5.Check if the same issue occurs with other SharePoint site collections.
Hope the information can help you. And if there have any unclear or misunderstanding, please feel free to post back and we’ll continue to help you all the time!
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