Velixo formulas do not work, return #N/A

Overview

When trying to execute a Velixo formula, the cell in the formula returns #N/A.

Causes

The Disable all Application Add-ins (may impair functionality) checkbox is checked, rendering Velixo non-functional.

Resolution

In Excel, navigate to File → Options.

Go to Trust Center → Trust Center Settings…

Go to Add-ins and ensure the Disable all Application Add-ins (may impair functionality) checkbox is unchecked.

Restart Excel.