When I try to open Airtable on my iMac, running MacOS High Sierra 10.13.6, it opens as a completely blank window. No information is displayed, When I first installed it, it ran fine. I am using the latest version of Airtable for the Mac, 1.4.5. Any ideas why this might be happening? Airtable runs fine on my iPhone and Surface Pro. And two of my friends running Macs use Airtable with no problems.