The black "Scrolling Ride Signs" for the each of the ride queue lines which scroll the Ride Name are broken an do not work properly. They will work at first for awhile including after building a new ride for awhile.
However, if you exit the game for any reason for awhile then go back to it later on to play more and look at Scrolling Signs again at that point in time you'll notice they completely stop scrolling and stay blackened with no ride names scrolling on them.
The only workaround I've found is closing and reopening the old ride and then the black scrolling sign will turn back on again and be fine but then the same problem repeats itself later on again. The same thing will happen for building new rides past that too.
However, if you exit the game for any reason for awhile then go back to it later on to play more and look at Scrolling Signs again at that point in time you'll notice they completely stop scrolling and stay blackened with no ride names scrolling on them.
The only workaround I've found is closing and reopening the old ride and then the black scrolling sign will turn back on again and be fine but then the same problem repeats itself later on again. The same thing will happen for building new rides past that too.