Hi, Tested version: 0.6 and 0.5 (Windows 10 64bit) I’ve tried to enable the parallel threading option (--threads …) which effectively resulted in a faster processing time but unfortunately the result was wrong. Half of the geometry was missing, like walls, and materials had problems as well. I’ve tested it with multiple IFCs and the error was consistent enough. Without the option it works flawlessly both in 0.6 and 0.5. When calling the converter I also had more options enabled which may affect the...