Error: "Not Enough Memory To Generate A Preview"

(If the above paragraph sounds like gobbledegook, don't stress - it's a geek thing. Our software will work fine without it.)

It turns out this is a known issue in Photoshop CC that has started happening after the Windows 10 Creators Update.

https://helpx.adobe.com/photoshop/kb/invalid-numeric-entry-integer-96-8-required-photoshop.html

https://feedback.photoshop.com/photoshop_family/topics/photoshop-cc-2018-an-integer-between-96-and-8-is-required-closest-value-inserted

https://forums.adobe.com/thread/2431562