I can’t test Mac releases, but I know that
several weeks old win releases still works.
Was it necessary to log in to Amazon again after the reinstallation?
If not, the SF cache hasn’t been removed ..
.. that should always be the first step when something isn’t working.
According to this topic here it’s also possible
that there is a new A/B test (changed layout).
If there were a general Amazon problem with Macs, there would be more reports.