Hi Wayne and sorry for the delayed reply.

I looks like a connectivity issue between your PC and flickr server.

Does the issue still occur?

I installed the latest Build 664 (solving my antivirus issue).  After installation, I tried to download some photos from Flickr.  The thumbnails of the photos on the Flickr page did not appear in the "Download multiple media items" pop-up window (each thumbnail was blank).  When I selected some thumbnails for download, the first thumbnail was highlighted in green and spinning, but no image was downloaded and the process did not complete.  In short, new Build 664 is not working at all for me.  Do you have any suggestions or possible fixes for me?  Thank you!

P.S. If it helps, I receive this error message in the bottom pane...

2020-04-14 17:03:38: error: error while downloading: https://www.flickr.com/photos/null/49756127401, https://live.staticflickr.com/65535/49756127401_4e81a008a2_o.jpg, exception= timeout. retrying