Your PHP version appears to be a very old 5.6.30, you can check under Admin -> Tools -> Maintenance.

Anyway, getting a derivative image from the URL the album page links reveals they are delivered as 0 byte files. For example
http://avery.gusdate.com/i.php?/upload/ … b4b-la.jpg

The 12 megapixels original image is there
http://avery.gusdate.com/upload/2020/09 … debb4b.jpg

Likely during generating the thumbnails and derivative sizes the maximum execution time of your hoster kicks in. You can see the current value under Admin -> Tools -> Maintenance, at PHP click on Show info and then search for max_execution_time. Cheap shared hosting plans tend to limit that too restrictive. Maybe in the server log there's some hint what happens if you upload an image. If time limit kicks in probably the only thing you could try then would be to use smaller resolution original images instead of 12 megapixels so processing would take less time.

Maybe using ImageMagick instead of GD could also help.

See also [FAQ] My pictures don't appear!