What it used to be:
What it is currently:
Difference I can see:
- Current selected system doesn't have light grey overlay
- Current selected sector and its grid lines don't have a bright grey overlay either
Maybe something related, but if you're camera is near the system box edges and faces, it seems to have some render issue where a part of the cube hides stars, black holes, ... behind it. The system box itself appears to be black so it's hard to spot.