If ads are appearing in other browsers (like Chrome) or apps, you must ensure the global filter is active.
When you enable AdBlock in 1DM:
because they do not trust certain user certificates, which prevents them from applying "cosmetic rules" to hide ads on secure sites. Step-by-Step Recovery Update Filter Lists 1dm adblock not working
If the ad blocker in 1DM (formerly IDM) is not working, it is usually due to 1dm AdBlock Not Working — Troubleshooting Write-up If
Before diving deep, check these two common issues first: Go to Settings > Privacy
However, a growing chorus of users is reporting a frustrating issue: