Check you Preferences settings on your profile and be sure all the appropriate notifications are checked off. I have been getting notifications on old subscribed threads I posted on in the new platform again and on new threads I have posted on. I have NOT been getting emails on "subscribed" threads from the old platform when the thread is posted on by someone else here unless those conditions were the case.
Can anyone else confirm this the case? If so, it should be looked into as well. I can see Paul has been very busy making changes, tweaks and doing fixes. Busy beaver today, for sure. If it's just me, I don't want to bother him on it right now.