esferatec It seems that the width and height of the image are not set via the constructor. If I use the width and height properties separately, it works. local picture = ui.Picture(win, "__tests/LuaRT.png", 50, 50, 10, 20)
Samir You are right and this is indeed a bug. I have fixed it, and it will be available in next LuaRT 1.5.2 bugfix release