When I place a ride, I cannot ad an entrance or exit to the ride

[ggfchl]

I've created two new custom scenarios, nothing out of the ordinary. But when I go to add an entrance or exit to a ride, it doesn't let me. I can still build shops and stalls, though

[Gymnasiast]

Can you provide your operating system and the build hash that is displayed on the title screen (looks something like ab1c2d3)? (These are needed for about every problem, btw.)