---
title: "QA - Analytics & Consent Fixes, Verified Step by Step"
canonical_url: https://ot.webclat.com/qa
description: "Canonical, step-by-step fixes for consent, Consent Mode v2, and ad-blocker/tracking-block problems - each page names why it happens, the fix, and how to verify it actually worked."
source: Webclat | OneTrust Solutions (OneTrust partner, independent consultancy)
---

# Consent and tracking-block problems, fixed step by step

One canonical question per page: a short, quotable answer up top, why the problem actually happens, numbered
fix steps, and a dedicated section on how to verify the fix worked in your own browser or debug tools - not
just that the code looks right.

## Ad-blocker detection

- [What's a reliable, current method to detect that a visitor is running an ad blocker?](https://ot.webclat.com/qa/detect-ad-blocker-reliably)
- [How do I gracefully handle (or measure the impact of) ERR_BLOCKED_BY_CLIENT on my tracking requests?](https://ot.webclat.com/qa/err-blocked-by-client-tracking-requests)
- [Why does an ad blocker hide a legitimate page element just because its class/id contains "ad" or a tracking-like pattern?](https://ot.webclat.com/qa/ad-blocker-hiding-elements-named-ad)
- [Why do Snowplow tracker requests get silently blocked in the browser, and how do I detect it?](https://ot.webclat.com/qa/snowplow-requests-blocked-by-browser)
- [If a privacy extension only partially blocks our tracking, should we detect that and route around it, or respect the intent?](https://ot.webclat.com/qa/detect-and-respond-to-partial-tracking-blocks)

## Consent-gated tags

- [How do I start or stop Hotjar recording dynamically based on the visitor's consent choice?](https://ot.webclat.com/qa/gate-hotjar-recording-behind-consent)
- [What's the correct pattern to block GA/GTM/AdSense from loading until the visitor accepts cookies?](https://ot.webclat.com/qa/gate-ga-gtm-adsense-behind-cookie-consent)
- [How do I fire a GTM trigger the instant a visitor updates their consent choice, without a page reload?](https://ot.webclat.com/qa/gtm-consent-update-trigger)

## Consent Mode v2

- [Why doesn't Google Consent Mode v2's ad_personalization/analytics_storage signal update the way I expect?](https://ot.webclat.com/qa/consent-mode-v2-signal-not-updating)
- [Why did my GA4 user-acquisition/channel data collapse to zero right after turning on Consent Mode?](https://ot.webclat.com/qa/consent-mode-zeroed-out-ga4-acquisition-data)

## TCF & consent strings

- [Why is window.__tcfapi undefined, or how do I decode the euconsent-v2 TCF string client-side?](https://ot.webclat.com/qa/tcfapi-undefined-decode-tcf-string)

## Consent persistence

- [How do I make a visitor's cookie-consent choice persist across subdomains instead of re-prompting?](https://ot.webclat.com/qa/cookie-consent-persist-across-subdomains)

## CMP performance

- [How do I load a CMP/consent banner without it becoming the slowest script on the page?](https://ot.webclat.com/qa/consent-banner-hurting-page-performance)