So the Master meter docked on the rightmost side of the mixer is very laggy. It is sometimes 5 or 10 seconds behind the audio. It will show a level, then just stay frozen at that level for another 5 seconds then freeze at a new level.
The same projects (I tested 2 separate ones, both with really low cpu usage) in 7.5.3 the meter behaves normally.
Note the rest of the meters in the mix view are fine and appear to be responding correctly.
1 project: 6 midi tracks, 1 instance of Halion 5
Other project: 6 audio tracks, no effects/vsts in use.