Hello. There is a bug when trying to use the laser for a vector image in Luban 3.7.0. This happens after loading an image which gives you a choice of three types, when altering the value of the slider for B&W after Vector has been the selected type. Whatever value you give to the slider or typed into the dialogue box, the value of 20 for B&W is returned on a return keypress or a tab keypress and it cannot be set to any other value.
Another error is seen in Luban when selecting Laser and clicking. An error box appears on screen -
"Project Recover — The program quit due to an unknown error (reason). Do you want to want to recover your last project?