Developer response:
Hey Ben, that's because with the new update, YouTube implemented a new protocol (called QUIC) that affects Opera Max. The team is looking into fixing the issue though. Thanks for the comment and your patience. /Anda

Hi,
First, great app!!
However I've noticed in the last few days that YouTube has stopped compressing. I used to get great savings, but now I'm getting almost nothing (like 16k on 200Mb).
Running the very latest version of both apps on a Samsung Galaxy S7 Edge. Carrier is Optus in Australia.
Has worked for months perfectly.
Tried rebooting. Other apps are still showing a savings (Instagram 46% for the month). YT isn't blocked within the app and I can't find a SSL option that may be encrypting the data.
Anyone else experiencing this?