It dont need to be win 10, i have seen that before, a long time ago and was the reason for why i look for a different way to make moldings around door/ window's, when i find the ppm tool.
1-2 year later i should open the drawing again to check something and all the Blocks was back again ?
V18, V19, V20, V21, 2015/ 16/ 17/ 18 Pro. Platinum
Deluxe V20, V21, 2015/ 16/ 17
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB