Changing the ROM did not solve it for me. The issue is random, sometimes all the segments are fine...
You're right... I experimented a bit more and the problem still happened with the other ROM as well.
Have you tried to run the backglass in Non-EXE-mode?
Non-EXE mode didn't make a difference for me. However at least it seems I discovered a pattern. When VP is started for the first time, the backglass is OK. But if I exit the table back to the editor and start playing again (without quitting VP), the display problem shows up consistently in all cases. Then I completely closed VP and restarted it, at the first try the backglass was OK, but restarting the game without leaving VP messed up the display repeatedly.
Since HyperPin quits VP whenever you exit to the menu and restarts it when the table is started again, the issue is not present if running the table from HyperPin. I guess that's why I thought the problem was fixed when I switched the ROMs...