Hello @OneStarAwake thanks for posting - the screenshot is really helpful. We're going to look into this, but there are a few things you could try in the meantime:

1. Clear your Chrome cache for Mumsnet, then close down and reopen Chrome.
2. Try switching between Wi-Fi and mobile data, in case something on the network is blocking an ad-related script.
3. Check whether you have any VPN, private DNS, antivirus, “safe browsing”, or tracking protection enabled on your phone, as these can sometimes behave like ad blockers even if you haven’t installed one.
4. Make sure Chrome is fully updated.

Let us know if any of the above works.