Wordpress v5.5 breaks Atahualpa - but a fix has been found.
 

Due to the work of one of our members (kdawes01), a way past the current issue with WP 5.5 has been found. I'll try to relase a new version tomorrow (9/24/2020) here on the forum. However, be aware that Atahualpa in no longer under development and something else could cause a problem in the future.

WordPress has finally broken Atahualpa. As of the 5.5 release, wordpress has changed something in the base code that causes Atahualpa links not to work any more.

With the dwindling use of Atahualpa and the amount of time it would take to trackdown and possible rewrite the theme to correct this issue, Atahualpa will no longer work as of WordPress version 5.5

It was a good run while it lasted.