I've installed ad block on my Galaxy S3 and on my Galaxy Tab 2 10.1 to be able to listen to the music on youtube without annoying ads. I don't have the root permissions but I've set up the proxy manually (localhost and port 2020). I've rebooted both the devices and now the app says "ads blocked on wifi connection" but... I already see some vevo ads among some songs.
Could you help me to understand why?