Membership plugin not showing images with Download/Media Protection set


I need to resolve why membership is blocking all images when I set up the masked url in Options --> Downloads / Media Protection.

A year ago I had the exact same problem and tried to solve it on this forum but to no avail. See here. I was told an update to membership would likely fix it but that didn't happen. I simply left it unprotected until now but I really need this done going forward.

I've attached screenshots below in order with the following description of settings and problem:
(1) Free User setting allows access to download group
(2) Options Setup
(3) blocked image on page for free user
(4) masked url path with no image found by plugin, but (5) if type in actual download path works for free user