---
title: "Why might the Monocle script fail to load?"
type: "faq"
url: "https://docs.spur.us/knowledgebase/faqs/why-might-the-monocle-script-fail-to-load"
category: "Spur Platform & Data"
product: "monocle"
publishedAt: "2026-09-03T12:00:00.000Z"
updatedAt: "2026-09-11T13:31:19Z"
---

# Why might the Monocle script fail to load?

This is usually caused by mcl.io being blocked by a firewall, DNS filter, or endpoint security tool. Confirm the domain is allowlisted, and test in an incognito window or from another network to isolate the cause.