Apologies for the half-baked answer!
1. I'm on 3.9.438 for the moment, but that should be close enough.
2. The "Watch TV" function on the EPG tab gets me nowhere.
3. Navigate to Configuration -> Channel/EPG -> Channels and you'll see the "Play" links for each channel. However, clicking them simply results in a download instead of a stream (for me)
4. However however, right-clicking a link and copying the URL gives me something like
http://<server-IP>/stream/channel/89bf3a4277d34af5a6bea33191efbcc7
Switching to VLC and using Media -> Open Network Stream with that url and all works fine.
I suspect it's all to do with the changes in channel config during the dvb rewrite - the /stream/channel/xxxxx URL isn't being detected as streaming so never triggers a handover to VLC.