Yay! This problem is solved for me by installing version

Sweet Home 3D ® Version 6.4.2 Java version 1.8.0_202 - 64bit - 0.2 / 4.8 GB Java 3D version 1.6.1

I am SOOOOO glad this is now working as I love the program! [:)]

I'm having the same problem. Got a new computer with twin graphics cards, Intel & NVIDIA. Worked fine on my previous laptop running Windows 10. On the new laptop, works when only using the built in monitor (running on the Intel card) but messes up if the additional monitor is turned on (on NVIDIA ...