Greetings, I'm just learning Swift language by Playgrounds and some Udemy educations. I have a problem with Coding 2 - Connect and Solve episode. I supposed to build 3 - 2 - 3 blocks to three spots on 2nd column BUT blocks are acting like ghosting, it appears like for 0.5 seconds and disappear again. Then only change that I made is updating MacOS system with the lastest patch. Open to any ideas about the issue. Tnank you!