Build Mode Stops Working, Followed by Save Freeze

Lately, my game has been bugged whenever I enter Build Mode. In an older file, I tried building on an empty lot in Windenburg. At first, I started with the walls, and the issues came up when I placed the roofs; resizing, deleting, and changing the color/texture didn't work. I tried Buy Mode, placing a tree to see if it was an issue affecting only the roofs, but it also affected the tree (and other objects). I would get back to Live Mode to save the progress up to that point; however, I would stay stuck on the save screen. After 10 minutes, I forced-quit the game.

I thought it only affected that file. After downloading Cottage Living, I made a new file and moved my new family into an empty lot in Henford-on-Bagley. The same issue occurred: as I made it to the roofing, nothing would work, despite the sound effects of deleting/placing/buying playing. I went back to Live Mode to save the progress, and again the game got stuck on the save screen, so I had to force-quit.

It's frustrating, especially since I was excited to try out Cottage Living. Is anyone else experiencing the same issue? If so, did you find a solution? Thank you!